Question

A boy runs for 20 min. at a uniform speed of 18km/h. At what speed should he run for the next 40 min. so that the average speed comes 24 km/hr. step by step​

Answer 1

Answer: 36 km/h

Explanation: average speed is

2× speed 1× speed2/ speed1+ speed2

Let speed2 be x

(2) (x) (18) /18+x = 24

36x/18+ x = 24

36x= 432 + 24x

12x = 432 x= 432/12

= 36 km/h

Answer 2

Answer:

36 km/h ok

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