A boy walks 10 km in 20 minutes- What is his speed in kmph-A- 20 kmphB- 30 kmphC- 40 kmphD- 10 kmph

The correct option is B 30 kmphGiven, distance = 10 km and time = 20 min We know that, Speed = Distance/Time We have to convert minutes to hours. We know that, ...

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Standard VII

Physics

Average Speed

A boy walks 1...

Question

A boy walks 10 km in 20 minutes. What is his speed in kmph?

10 kmph

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20 kmph

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30 kmph

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40 kmph

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Solution

The correct option is C 30 kmph
Given, distance = 10 km and time = 20 min
We know that,
$S p e e d = \frac{D i s t a n c e}{T i m e}$
We have to convert minutes to hours.
We know that,
1 hour = 60 min
$20 m i n u t e = \frac{20}{60} = \frac{1}{3} h$
Speed of the boy $= \frac{10}{\frac{1}{3}}$ $= 30 k m p h$

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A boy walks 10 km in 20 minutes. What is his speed in kmph?

The correct option is C 30 kmphGiven, distance = 10 km and time = 20 min We know that, Speed=DistanceTime We have to convert minutes to hours. We know that, 1 hour = 60 min 20 minute=2060=13 h Speed of the boy =1013 =30 kmph