A train of length 140 m is running at a speed of 60 km/hr and a dog is running in the same direction parallel to the train at a speed of 18 km/hr. The train will cross the dog in
Detailed Explanation:
Relative speed = Train speed − Dog speed = 60 − 18 = 42 km/h = 42 × (5/18) = 35/3 m/s.
Time to cross = Length / Relative speed = 140 ÷ (35/3) = 140 × (3/35) = 12 seconds.
Therefore, the train will cross the dog in 12 seconds, making Option 2 the correct answer.
Question 3 of 5 Time, Speed, Distance and Work
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