Q:

A) 13.96% | B) 13.63% |

C) 13.56% | D) 14.01% |

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0

Q:

A) Bahubali | B) Bhoomi |

C) Newton | D) Daddy |

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Q:

A) 250 mts | B) 400 mts |

C) 320 mts | D) 390 mts |

Answer & Explanation
Answer: B) 400 mts

Explanation:

Explanation:

Let the length of the 1st train = L mts

Speed of 1st train = 48 kmph

Now the length of the 2nd train = L/2 mts

Speed of 2nd train = 42 kmph

Let the length of the bridge = D mts

Distance = L + L/2 = 3L/2

Relative speed = 48 + 42 = 90 kmph = 90 x 5/18 = 25 m/s(opposite)

Time = 12 sec

=> 3L/2x25 = 12

=> L = 200 mts

Now it covers the bridge in 45 sec

=> distance = D + 200

Time = 45 sec

Speed = 48 x5/18 = 40/3 m/s

=> D + 200/(40/3) = 45

=> D = 600 - 200 = 400 mts

Hence, the length of the bridge = **400** mts.

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7

Q:

A) 1997 | B) 1998 |

C) 1999 | D) 2000 |

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