Time & Distance Mcqs

a. 39 seconds

b. 40 seconds

c. 39.38 seconds

d. 39.5 seconds

ANSWER: 40 seconds Answer & Explanation

 

The first pole is crossed at the zeroth second. The timer starts after the car crosses the first pole. Let the distance between each pole be x m. To reach the 16th pole, the distance travelled by the car is 15x. The speed of the car is 15x/30 = x/2 m/s To reach the 21st pole, it has to travel a distance of 20x. Time taken
= 20x÷(x/2)
= 40 seconds