**
A 270 metres long train running at the speed of 120 kmph crosses another train running in opposite direction at the speed of 80 kmph in 9 seconds. What is the length of the other train?
**

##### Explanation

Relative speed = (120 + 80) km/hr

= | 200 x | 5 | m/sec | |

18 |

= | 500 | m/sec. | |

9 |

Let the length of the other train be *x* metres.

Then, | x + 270 |
= | 500 |

9 | 9 |

*x* + 270 = 500

*x* = 230.