Question
The ratio of the speed of a truck to a car is 6:5 and the car travels 12 km less than the truck in the same time. If the time taken by the truck to travel that distance is 3 hours, then find the speed of the car.
Solution
ATQ, Distance = speed * time Time = distance/speed Let the distance travelled by the truck = d km So, d / (6x) = (d − 12) / (5x) 5d = 6d − 72 d = 72 km Now, 72 / (6x) = 3 72 = 18x x = 4 The speed of the car = 5 * 4 = 20 km/hr
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