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Q.

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

512 hours

b

412 hours

c

312 hours

d

112 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.
∴60×2=80×x
⇒x=60×280=32
Hence, the time taken will be 112 hours.
 
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