A car covers a distance of 840 km at a c...

A car covers a distance of 840 km at a constant speed. If the speed of the car would have been 10 km/h less, then it would have taken 2 hours more to cover the same distance. What is the actual speed of the car ?

a)60 kmph

b)70 kmph

c)80 kmph

d)90 kmph

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