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Quantitative Aptitude

Directly Proportional

A guy rides h...

Question

A guy rides his bike 20 km at an average speed of 25 kmph and again travels 24 km at an average speed of 20 kmph. What is his average speed for the entire trip?

A

22 kmph

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B

11 kmph

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C

20.9 kmph

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D

24 kmph

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E

None of these

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Solution

The correct option is A
22 kmph

Average Speed = $\frac{T o t a l d i s t a n c e}{T o t a l t i m e}$

$\Rightarrow$ Average Speed = $\frac{20 + 24}{\frac{20}{25} + \frac{24}{20}}$

$\Rightarrow$ Average Speed = $\frac{44}{2}$ = 22 kmph

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