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A car travels a distance AB at a speed o...

A car travels a distance AB at a speed of 40 km/hr and returns to A at a speed of 30 km/hr. What is the average speed for the whole journey?

A

zero

B

`34.3kmh^-1`

C

`68.6kmh^-1`

D

`120kmh^-1`

Text Solution

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The correct Answer is:
B
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