Math, asked by shivaninandani8728, 1 year ago

a man walks to his office at 5 km/hr and then goes back on a rickshaw at 15 km/hr. find the average speed for the whole journey

Answers

Answered by 9827070255
4
we have to find the speed in this so,

we know that = speed = distance / time

=  total distance / total time 
= 15 + 5 / 1+1 =  20 / 2
= average speed = 10 km/h 
Answered by ruturajrp
8
Speed = distance/time

In first case,
5 = d1/t1
∴ d1 = 5t1

In second case,
15 = d2/t2
∴ d2 = 15t2

As the distance traveled is same d1=d2
∴ 5t1 = 15t2
∴ t1 = (15/5)t2
∴ t1 = 3t2

Average speed = (total distance traveled)/(total time taken to cover the distance)
∴ Average Speed = (d1+d2)/(t1+t2)
 = (5t1 + 15t2)/(t1+t2)
Replacing t1 = 3t2
= (5(3t2) + 15t2)/(3t2 + t2)
= (15t2 +15t2)/4t2
= 30t2/4t2
= 15/2 or 7.5

The average speed is 7.5 km/hr

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