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Q.

A car covers a distance of 400 km at a certain speed. Had the speed been 12 km/hr more, the time taken for the journey would have been 1 hour 40 minutes less. Find the original speed of the car.

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a

60 km/hr

b

48 km/hr

c

53 km/hr

d

40 km/hr

answer is B.

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Detailed Solution

Concept- First, assume the initial speed of the car to be x. Then, we will use the formula of time i.e.

(time = \frac{distance}{speed})

. And form an equation as per the given condition. Let the speed of car

Distance covered

Time taken

hrs.
If the speed is increased by

the time taken

.
As per given in question,

So, the speed is

.
Hence, the correct option is 2.

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A car covers a distance of 400 km at a certain speed. Had the speed been 12 km/hr more, the time taken for the journey would have been 1 hour 40 minutes less. Find the original speed of the car.