Question

Anu climbs uphill at the rate of 4 km/hr and travels downhill at the rate of 8 km/hr. find her average speed.

Answer 1

Let s be the average speed and d be the distance.

So, the equation of time= distance/speed.

Thus, d/4+d/8=2d/s.

Therefore, 4ds+8ds=64d.

Which gives us 12s=64 i.e. s= 5.34.

So, the value of s which is the average speed is 5.34 km/hr.

So the average speed of Anu is 5.34 km/hr.