Important for :

1

D

Speed of the train = 6x m/s, speed of the man = x m/slength of the train = 650m,

time taken to cross a pole = 1 minute 5 seconds = 65 seconds

S = | D |

T |

6x = | 650 |

65 |

x = | 10 | = | 5 |

6 | 3 |

Speed of the man = | 5 | m/s |

3 |

Man can cross the 240m platform in | 240 |

5/3 |

= 144 seconds = 2 minutes 24 seconds

Hence, option D is correct.

2

3

4

5