A car travels from P to Q at a constant speed. If its speed were increased by 10

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A car travels from P to Q at a constant speed. If its speed were increased by 10 km/hr, it would have taken one hour lesser to cover the distance. It would have taken further 45 minutes lesser if the speed was further increased by 10 km/hr. The distance between two cities is :

Options:

A . 540 km

B . 420 km

C . 600 km

D . 620 km

Answer: Option B

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