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Q. |
## Two trains of length 110 m and 90 m are running on parallel lines in the same direction at 45 km/hr and 30 km/hr respectively. In what time will the first train pass the second train? |

A. | 28 sec |

B. | 36 sec |

C. | 42 sec |

D. | 48 sec |

Answer» D. 48 sec | |

Explanation: The trains are moving in the same direction, so their relative speed is (45-30) km/hr = 15 km/hr. We convert this speed from km/hr to m/sec by multiplying by 5/18, so relative speed = 15*(5/18) m/sec = 25/6 m/sec. The first train will have to cover a distance equal to the sum of the lengths of the two trains to pass the second train completely, which is 110 m + 90 m = 200 m. So, the time taken = Distance/Speed = 200 m / (25/6) m/sec = 48 sec. |

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