Question

A man travels from A to B at an average speed of 30km/h and returns From B to A along the same route at an average speed of 60km/h he average speed for the enter trip is?

Answer 1

Explanation:

Since the distance travelled is same !!

We can use Harmonic Mean for finding it

Average Speed=40.00km/h

Harmonic Mean is nothing but reciprocal of mean of reciprocal of the observations.

By using calculator we can find it as follows:

30÷M+

60÷M+

2÷Mrc=