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

2)420 km

3)600 km

4)620 km

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600 km

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Car travel at the speed of 60km/h so he reach 420 km in 7 hour,if speed is increase by 10 km/h so he reach 420 km in 6 hour at the speed of 70 km,and further speed is increase by 10 km/h, so he reach 420 km in 5 hour 15 min...

Gulshan Prasad Mogre

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