A car can finish a certain journey in 10 hours at the speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (in km/h) must be increased by

A car can finish a certain journey in 10 hours at the speed of 42 kmph

1.	A car can finish a certain journey in 10 hours at the speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (in km/h) must be increased by
A.	12
B.	18
C.	15
D.	24
Answer» C. 15

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A car can finish a certain journey in 10 hours at the speed of 42 kmph. In order to cover the same distance in 7 hours, the speed of the car (in km/h) must be increased by

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