Two cars are moving in the same direction with the same speed `30 km//hr`. They are separated by a distance of `5 km`, the speed of a car moving in the opposite direction of it meets these two cars at an interval of `4` minutes, will be.

Options

A. `40 km//h`
B. `45 km//h`
C. `30 km//h`
D. `15 km//h`

Answer

B

Explanation

Speed of car w.r.t. cars in opposite direction
`v_(r)=(v+30)`
`t=d/(v_(r)) implies 4/60=5/(v+30)`
`4v+120 =300 implies v=45 km//h`