Latest CSC Aptitude Question SOLUTION: A train travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs.What is the distance traveled A.) 210 k

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A train travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs.What is the distance traveled

A.) 210 kms
B.) 30 kms
C.) 60 kms
D.) 90 kms

Asked In CSC (12 years ago)

Unsolved Read Solution (2)

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Read Solution (2) :

Ankit Parmar  (11 years ago)

let the speed in the forward journey be x km/hr, also
given time taken in fwd journey = 7 hrs

during return journey

speed=(x+12)km/hr
time=5hrs

nw distance travelled in both the cases is same therefore

forward journey distance=return journey distance

7x=5(x+12)
7x-5x=60
2x=60
x=30km/hr

therefore distance travelled= 30*7=210km

or =5*(30+12)=210km

Is this solution Helpfull? Yes (9) | No (1)  

ganesh  (10 years ago)

Let the speed of the car be x
According to the formula given below we substitue

distance = speed * time
Distance travelled in the forward journey=7*x----(1)
Distance travelled in the reverse journey=5(x+12)=>5x+60.(2)

now,

7x-(5x+60)=0(=>7x gives the distance, 5x+60 also gives same distance )
so wen we subtract both we get 0.
7x-5x-60=0
2x=60
x=30--->which gives the speed of the forward journey.
when we substitute in the first eq we get
7*30=210km.

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