### Discussion :: Races and Games - General Questions (Q.No.7)

Muneer said: (Feb 4, 2011) | |

Why we are taking 45 in the solution? |

Gowthami said: (Jun 7, 2011) | |

A beats=36sec B beats=45sec so 36----45 then 1 part=45/36=5/4 B covers A in 100m race=(4/5)*100=80m so A beats B by=(total distance)100-B covers(80) 20m faster than B |

Himanshu Singla said: (Sep 22, 2012) | |

Here it is given that A can cover 100m in 36 sec and B in 45 sec. So when A reaches finish point B still has 9 sec left of his time to reach the final point. In this time he can cover the remaining distance by which he has been beaten. In 45sec B can travel 100m. In 1sec ------------- 100/45. In 9 sec ------------ (100/45) *9=20 Answer. HOPE you UNDERSTAND. Please clarify if am wrong. |

Marimuthu said: (May 31, 2013) | |

In 36 seconds B covers (100/45)*36 = 80 meters. In 36 seconds A covers 100 meters. So A beat B by 20 meters. |

Mridul Chakraborty said: (Nov 13, 2013) | |

Detailed solution for easier interpretation : Speed of A = 100 (distance)/36 (Time) = 2.78 m/s. Speed of B = 100(distance)/45(Time) = 2.22 m/s. Difference in speed between A & B = 0.56 m/s < i.e. 2.78-2.22 m/s> Hence in 36 seconds in which A finishes the race, B will cover 2.22*36 = 80 meters. So A finishes the race 20m ahead of B. |

Noname said: (Mar 16, 2015) | |

A 1sec - (100/36) m. B 1sec - (100/45) m. 1sec - A is ahead by (100/36-100/45) = 5/9 m. So, in 36s A is ahead by (5/9*36) = 20 m. |

Santhosh said: (Aug 27, 2015) | |

36/45*100 = 80. 100-80 = 20. |

Student said: (Nov 5, 2015) | |

That's a great help thanks a lot! |

T.Somadatta said: (Dec 23, 2017) | |

Speed of A = 100 (distance) /36 (Time) = 2.78 m/s. Speed of B = 100 (distance) /45 (Time) = 2.22 m/s. Difference in speed between A & B = 0.56 m/s < i.e. 2.78-2.22 m/s>. Hence in 36 seconds in which A finishes the race, B will cover 2.22*36 = 80 meters. So, A finishes the race 20m ahead of B. |

Sana said: (Jan 8, 2018) | |

Common time difference between A and B is =(45-36)=9sec. Now, B travel distance 100m in 45sec. So 45sec ----------> 100m 9sec ------------> (9/45)*100=20m. This 20m is actual distance between A and B or A beat by B in 20m . |

Purushotham Reddy said: (May 2, 2018) | |

20P---28P------100P. A---- B ---- C. Here, the difference between B and c is 8 points when you calculate only for 80 Points (from B to 100). So 8 Points - 80 Points. But we need for 100 points. Then 8p -80p. 10P-100P. Hope you understand. |

#### Post your comments here:

Name *:

Email : (optional)

» Your comments will be displayed only after manual approval.