Boats & Streams Mcqs

Q.  A man can row 30 km downstream and 20 km upstream in 4 hours. He can row 45 km downstream and 40 km upstream in 7 hours. Find the speed of man in still water?

a. 15 kmph
b. 10 kmph
c. 12 kmph
d. 12.5 kmph
e. None of these


ANSWER: See Answer
 
Let the speed of the man in still water be a kmph and let the speed of the stream be b kmph.

Now 30/(a + b) + 20/(a – b) = 4 and 45/(a + b) + 40/(a – b) = 7
Solving the equation, the speed of man in still water is 12.5 kmph.
MCQs:  A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is_________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A man can row three-quarters of a kilometre against the stream in 11 minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is:_________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A man can row 9 1/3 km/hr in still water and he finds that is thrice as much time to row u p than as to row down the same distance in river. The speed of the current is:________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9km/hr and the speed of the current is 3km/hr, the distance A and B is:_______?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The speed of a boat in still water is 2km/hr. If its speed upstream be 1km/hr then speed of the stream is________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A boat takes half time in moving a certain distance downstream than upstream. What is the ratio between the rate in still water and rate of current?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will he take to go 5km in stationery water?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A man can row 7 ½ kms on hour in still water and he finds that it takes hi twice as long to row down the river. The rate of stream is
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A man can row three-quarters of a kilometer against the stream in 11 ¼ minutes and return in 7 ½ minutes. The speed of the man in still water is________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A boat goes 6 km in an hour in still water. It takes thrice as much time in covering the same distance against the current. Speed of the current is_______?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A boat running upstream takes 8 hours 48 min to cover a certain distance while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and the speed of water current respectively?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  In a river, a man takes 3 hours in rowing 3 km upstream or 15 km downstream. What is the speed of the current?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A man can row at 5 km/hr in still water, if the river is running at 1 km/hr it takes him 75 minutes to row to a place and back. How far is the place?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The Total cost of flooring a room at Rs.8.50 per square meter is Rs.510. If the length of the room is 8km it’s breadth is__________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  The length of a rectangular increased by 10% and it;s breadth is decreased by 10 %. Then the area of the new rectangle is_________?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  Total area of the 64 small squares of aches board is 400cm2. There is 3cm wide border around the chess board. What is the length of each side of the chess board?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  A path of uniform width turns the inside of a rectangular field 38m long and 32m wide. IF the path occupies 600 m2 than the width of the path is_______?
Category: Mathematics Quizzes,   Published by: T-Code Scripts
MCQs:  How many meters of carpet 63cm will be required to be a floor of a room 14m by 9cm?
Category: Mathematics Quizzes,   Published by: T-Code Scripts