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Q.

During the first 18min of a 60min trip, a car has an average speed of 11ms−1. What should be the average speed for remaining 42 min so that car is having an average speed of 21 ms-1 for the entire trip?

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a

31 ms−1

b

35.6 ms−1

c

25.3 ms−1

d

29.2 ms−1

answer is A.

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Detailed Solution

detailed_solution_thumbnail

vav=dt=d1+d2t1+t2 21=(18) (11) +(42) (v)60 ⇒v=25.3 m/s

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