Question

a boy runs with a speed 10 km h for half time and 30km h for another half time the average speed will be​

Answer 1

Answer:

(10 +30)/2=20...;ie avg speed

Answer 2

Answer:

15 km/hr

Explanation:

supose we take the total distance of whole journey 60km,so the half will be 30 km

first we will find time of first half which will be-

t=d/s

t=30/10

t=3hr

then we find time of second half-

t=d/s

t=30/30

t=1 hr

we take total distance/total time

hence,

60/4hr

ans will be 15 km/hr

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