A car travels from P to Q at a constant ...

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

540 km

420 km

600 km

620 km

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