A person cover a distance in 40 minute if he drive a car at a speed of 45/hr on an average . The speed at which he must drive to reduce the time of journey to 30 minute is.........
.a) 42 km/hr......b) 48km/ hr.....c)54 km/ hr....d) 60km/ hr.
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answer is D 60 km/hr the car should travel at this speed to cover the distance in 30 minutes
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