A person covers a distance in 40 minutes if he drives at an average speed of 45 km/h. At what speed must he drive to reduce the time of journey to 30 minutes? MCQ with Answer and Explanation
A person covers a distance in 40 minutes if he drives at an average speed of 45 km/h. At what speed must he drive to reduce the time of journey to 30 minutes?
A. 60 km/h
B. 64 km/h
C. 70 km/h
D. 54 km/h
Answer: Option A
Solution (By JKSSB Mock Tests)
Distance is constant, so S1 * T1 = S2 * T2 => 45 * 40 = S2 * 30 => S2 = (45 * 40) / 30 = 60 km/h.
A car covers a distance of 180 km at a uniform speed. If the speed is increased by 10 km/h, the journey takes 3 hours. Find the initial speed of the car.
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