Two trains 140 m and 160 m long run at the speed of 60 kmph and 40 kmph respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

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9.6

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10.8

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Solution

The correct option is D
10.8

Relative speed = (60 + 40) kmph = $(100 \times \frac{5}{18})$ m/sec = $\frac{250}{9}$ m/sec.

Distance covered in crossing each other = (140+160) m = 300m

Required time = $(300 \times \frac{9}{250})$ sec = $\frac{54}{5}$ sec = 10.8 seconds

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Two trains 140 m and 160 m long run at the speed of 60 kmph and 40 kmph respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

The correct option is D 10.8 Relative speed = (60 + 40) kmph =(100×518)m/sec =2509m/sec. Distance covered in crossing each other = (140+160) m = 300m Required time = (300×9250)sec =545sec = 10.8 seconds

The correct option is D
10.8

Relative speed = (60 + 40) kmph = $(100 \times \frac{5}{18})$ m/sec = $\frac{250}{9}$ m/sec.

Distance covered in crossing each other = (140+160) m = 300m

Required time = $(300 \times \frac{9}{250})$ sec = $\frac{54}{5}$ sec = 10.8 seconds