Question 116
The length of two trains arc 140 m and 160 m respectively. If they run at the speed of 60 km/h and 40 km/h respectively in opposite directions on parallel tracks, then find the time in which they will cross each other.
Solution
Since trains are travelling in opposite direction,
Distance = Sum of length of two trains = 140 + 160 = 200 m
Relative speed =60 + 40 = 100 km/hr = $$\frac{100 \times 5}{18} = \frac{500}{18} m/s$$
Time = $$\frac{300 \times 18}{5}$$ = 10.8 sec
So, the answer would be option b)10.8 sec
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