A man runs $20 k m$ in $30 m i n .$ What is his speed?

10 k m / h r

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20 k m / h r

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40 k m / h r

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25 k m / h r

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Solution

The correct option is C $40 k m / h r$
Given:
Distance $= 20 k m$
Time $= 30 m i n = \frac{30}{60} h r = \frac{1}{2} h r$

$∴$ Speed = $\frac{D i s t a n c e}{t i m e}$ = $\frac{20 k m}{(\frac{1}{2} h r)}$
$\Rightarrow$ Speed $= 40 k m / h r$

Option (C) is correct.

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A man runs 20 km in 30 min. What is his speed?

The correct option is C 40 km/hrGiven:Distance =20 kmTime =30 min=3060hr=12hr∴ Speed = Distancetime = 20 km(12hr)⇒ Speed =40 km/hrOption (C) is correct.

A man runs $20 k m$ in $30 m i n .$ What is his speed?

The correct option is C $40 k m / h r$
Given:
Distance $= 20 k m$
Time $= 30 m i n = \frac{30}{60} h r = \frac{1}{2} h r$

$∴$ Speed = $\frac{D i s t a n c e}{t i m e}$ = $\frac{20 k m}{(\frac{1}{2} h r)}$
$\Rightarrow$ Speed $= 40 k m / h r$

Option (C) is correct.