Boats & Streams Mcqs

a. 2.4km/hr

b. 2.5 km/hr

c. 3.4km/hr

d. 3.5km/hr

ANSWER: 2.5 km/hr Answer & Explanation

 

Let the rate of the stream be x km/hr.

Then Speed downstream = (15/2 + x)km/hr.

Speed upstream = (15/2 -x)km/hr

(15/2 + x) = 2 (15/2 – x)

=> 3x =15/2

=> x = 15/6 = 5/2 = 2.5

Therefore, Rate of stream = 2.5 km/hr