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A car takes 2 hours to reach a destination by travelling at the speed of $60 km / h$ . how long will it take when the car travels at the speed of $80 km / h$ ?

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5 \frac{1}{2}

hours

4 \frac{1}{2} hours

3 \frac{1}{2}

hours

1 \frac{1}{2}

hours

answer is D.

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Detailed Solution

Let the car takes

x

hours to reach a destination by travelling at the speed of 80

km / h

.
From the question we have,

Speed (in km/hr)	60	80
Time (in hours)	2	$x$

So, more the speed, less will be the time taken. It is in inverse proportion.

∴ 60 \times 2 = 80 \times x

\Rightarrow x = \frac{60 \times 2}{80} = \frac{3}{2}

Hence, the time taken will be

1 \frac{1}{2}

hours.

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A car takes 2 hours to reach a destination by travelling at the speed of 60 km/h. how long will it take when the car travels at the speed of 80 km/h?

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A car takes 2 hours to reach a destination by travelling at the speed of $60 km / h$ . how long will it take when the car travels at the speed of $80 km / h$ ?