A man sitting in a train which is traveling at 50 kmph observes that a goods train, traveling in opposite direction, takes 9 seconds to pass him. If the goods train is 280 m long, find its speed.?

A) 60 | B) 62 |

C) 64 | D) 65 |

Explanation:

Relative speed = m / sec = kmph = 112 kmph.

Speed of goods train = (112 - 50) kmph = 62 kmph.

view answer Workspace Report Error Discuss

Subject: Problems on Trains - Quantitative Aptitude - Arithmetic Ability

Two cogged wheels of which one has 32 cogs and other 54 cogs, work into each other. If the latter turns 80 times in three quarters of a minute, how often does the other turn in 8 seconds?

A) 48 | B) 24 |

C) 38 | D) 36 |

Explanation:

Less Cogs more turns and less time less turns

Number of turns required=80 × × = 24 times

view answer Workspace Report Error Discuss

Subject: Problems on Trains - Quantitative Aptitude - Arithmetic Ability

A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train ?

A) 69.5 km/hr | B) 70 km/hr |

C) 79 km/hr | D) 79.2 km/hr |

Explanation:

Let the length of the train be x metres and its speed by y m/sec.

Then,

Now,

8y + 264 = 20y

y = 22.

Speed = 22 m/sec =km/hr = 79.2 km/hr.

view answer Workspace Report Error Discuss

Subject: Problems on Trains - Quantitative Aptitude - Arithmetic Ability

Two trains having equal lengths, take 10 seconds and 15 seconds respectively to cross a post. If the length of each train is 120 meters, in what time (in seconds) will they cross each other when traveling in opposite direction?

A) 10 | B) 25 |

C) 12 | D) 20 |

Explanation:

Speed of train 1 = = 12 m/sec

Speed of train 2 = = 8 m/sec

if they travel in opposite direction, relative speed = 12 + 8 = 20 m/sec

distance covered = 120 + 120 = 240 m

time = distance/speed = 240/20 = 12 sec

view answer Workspace Report Error Discuss

Subject: Problems on Trains - Quantitative Aptitude - Arithmetic Ability

Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

A) 9 | B) 9.6 |

C) 10 | D) 10.8 |

Explanation:

Relative speed = (60 + 40) km/hr =[ 100 x ( 5 / 18 ) ]m/sec = ( 250 /9 ) m/sec.

Distance covered in crossing each other = (140 + 160) m = 300 m.

Required time = [ 300 x ( 9/250 ) ] sec = ( 54/ 5 )sec = 10.8 sec.

view answer Workspace Report Error Discuss

Subject: Problems on Trains - Quantitative Aptitude - Arithmetic Ability