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Q.

A car runs at a speed of 40km/hr when not serviced and runs at 60 km/hr when serviced. After servicing the car covers a certain distance in 5 hr. The time will the car take to cover the same distance when not serviced is

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a

7.5 hr

b

7 hr

c

8 hr

d

6 hr

answer is B.

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Detailed Solution

When serviced, speed $= 60 km/hr, time = 5 hours$

Distance $= speed \times time = 60 \times 5 = 300 km$

When not serviced, speed $= 40 km/hr$

Distance $= 300 km$

Time $= \frac{distance}{speed} = \frac{300}{40} = 7.5 hours$

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