Q67
ArithmeticSpeed, Time & Distance
What is the ratio between times taken by a train 240m long to cross an electric pole and a bridge of 80m length?
- a.2 : 3
- b.3 : 4
- c.4 : 5
- d.5 : 6
Answer: (B) 3 : 4
To pass a pole the train covers its own length, 240 m; to cross the bridge it covers 240 + 80 = 320 m. At the same speed the times are in the ratio 240 : 320 = 3 : 4. Forgetting the train's own length on the bridge gives a wrong ratio such as 3 : 1.