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A car travelling at a speed of 42 km/hour can complete a journey in 12 hours. How long will it take to travel the same distance at 63 km/hour?
Question

A car travelling at a speed of 42 km/hour can complete a journey in 12 hours. How long will it take to travel the same distance at 63 km/hour?

A.

3 hours

B.

8 hours

C.

5 hours

D.

7 hours

Correct option is B

Given
Initial speed = 42 km/h
Initial time = 12 hours
New speed = 63 km/h
Formula Used
Distance = Speed × Time
Time = DistanceSpeed \frac{Distance}{Speed}​​
Solution
Total distance = 42 × 12 = 504 km
New time required = 50463=8\frac{504}{63} = 8  hours​
Final Answer
So the correct answer is (b)

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