Two trains leave a railway station at the same time. The first train travels due west and the second train travels due north. The first train travels 5 km/hr faster than the second train. If after two hours, they are 50 km apart, find the speed of first train.
Let the speed of the second train = x km/hr
The speed of the first train = x+5 km/hr
Distance covered after two hours by the first train is 2(x+5) km.
Distance covered by the second train after two hours is 2x km.
(2x)^2 + 4(x+5)^2=(50)^2 (Using pythagoras theorem)
Solve
We get x=-20 and x=15
The speed of the first train = 15+5=20km/hr
option 3
Each and every person in this world are having "constant mind"...DIFFERENTIATE others mind and INTEGRATE urs.MATHEMATICS SIMPLY MAKES YOU UNSTOPPABLE !!!
VIBHAV ANAND
Mathematics is one word which is useful in every bits of our life,whether we have to put one step or to think anything.