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A train ‘B’ speeding with 100 kmph crosses another train C, running in the same direction, in 2 minutes. If the length of the train B and C be 150 metre and 250 metre respectively, what is the speed of the train C (in kmph)?
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- 75
- 88
- 95
- 110
Correct Option: B
Let the speed of train C be x kmph.
∴ Relative speed of B
= (100 – x ) kmph.
| ∴ Time taken in crossing = | |
| Relative speed |
| ⇒ (2/60) = |  |  | |||
| 1000 | |||||
| 100 − x | |||||
| ⇒ | = | ||
| 30 | 5(100 − x) |
| ⇒ | = | ||
| 6 | 100 − x |
⇒ 100 – x = 12
⇒ x = 100 – 12 = 88 kmph.
