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 24km/hr.​

Answer 1

Explanation:

Therefore speed should be 27km/hr.

PLEASE MARK BRAINLIEST.

Answer 2

Average speed = 12km/hr

total distance/ total time = D1+ D2

total time= 20+40min =60min

1hr

D1= speed *time = 9*1/3 (20min)

=1/3 hr)

=3km

D2=?

24=3+D2/1

24-3= D2

D2 = 21 km

Speed = distance/ time

=21/60/40

=21/2/3

= 31.5 km/ hr