A car travels from P to Q at a constant speed If its speed were increased by 20km hr it would have t...........

Quantitative Aptitude ( CCS) Time & distance

A car travels from P to Q at a constant speed. If its speed were increased by 20km/hr, it would have taken two hour lesser to cover the distance. It would have taken further 30 minutes lesser if the speed was further increased by 10 km/hr. The distance between the two cities

100 km

120 km

150 km

180 km

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Explanation:

Let the distance between two cities = D,
D = x*t (x = usual speed and t is the actual time)
D = (X + 20)*(T -2) and D = (X +30)*(T – 2.5)
Solve the above equation, u will get T = 5 and X = 30, so distance = 30*5 = 150 km