Question

6. A cyclist rides from A to B at an average speed of 15km/h and returns back with an average speed of
20km/h. Find the average speed for the entire trip.
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Answer 1

Explanation:

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Answer 2

Answer:it should be 120/7 kmph!

Explanation:

It is very easy... see, if you take the LCM  of 15&20, it is 60!

so, to cover 60 kms from A-B, you take 4 hours.... and B-A you take 3hrs...

So, you take 7 hours to travel 60+60km=120kmph...

We know, avg speed= total destance / total time.....

120kms/7hrs....

therefore, your answer is 120/7kmph..

=17.142857142857......