1] A train can travel 20% faster than car.Both start from point A at the same time and reach point B 75 kms away from A at the same time.On the way however the train lost about 12.5 minutes while stopping at the stations.The speed of the car is
Solution
Let the speed of the car is x km/hr
speed of the train is x + 20% of x = (6x) / 5 km/hr
5 / (6x) * 75 + 25 / (2* 60) = 75/x
375 / 6x + 5/24 = 75/x
375 / 6x - 75/x= - 5/24
-[80/6x] = - 5/24
x = 60
Solution
Let the speed of the car is x km/hr
speed of the train is x + 20% of x = (6x) / 5 km/hr
5 / (6x) * 75 + 25 / (2* 60) = 75/x
375 / 6x + 5/24 = 75/x
375 / 6x - 75/x= - 5/24
-[80/6x] = - 5/24
x = 60
can you explain this sum by short trick
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