Time & distance

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A train covers a distance of 180 km in 4 hours. Another train covers the same distance in one hour less. What is the difference in the distances covered by these two trains in one hour?

45 km

40 km

15 km

9 km

Explanation:

TRAIN 1 COVERS 180 KM IN 4 HOURS
TRAIN 2 COVERS 180 KM IN 3 HOURS
Then, the speed of the 1st train is = $\frac{180}{4}$ = 45km/h

Then, the speed of the 2nd train is = $\frac{180}{3}$ = 60km/h

THEREFORE, THE TRAIN 1st COVERS 45 KM IN 1 HOUR...
AND THE TRAIN 2nd COVERS 60 KM IN 1 HOUR...

THEREFORE THE DIFFERENCE BETWEEN THE DISTANCE OF THEM IS :-

DISTANCE COVERED BY 2ND TRAIN IS SUBSTRACTED BY THE DISTANCE COVERD BY 1ST TRAIN...
= (60 - 45) KM = 15 KM

Therefore the difference of the distance covered by these trains in 1 hour is 15 KM.

Hence, option 3 is the correct answer.

By: Amit Kumar

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