Let the speed of Kaushik be **Sk** and speed of Piyush be **Sp** and let the time taken by Piyush be** t** second then,

$\frac{\mathbf{Sk}}{\mathbf{Sp}}\mathbf{}\mathbf{=}\mathbf{}\frac{{\displaystyle \frac{\mathbf{800}}{\mathbf{t}\mathbf{+}\mathbf{20}}}}{{\displaystyle \frac{\mathbf{600}}{\mathbf{t}}}}\mathbf{}\mathbf{=}\mathbf{}\frac{\mathbf{2}}{\mathbf{3}}\left(\mathrm{since}\mathrm{given}\mathrm{ratio}\right)$

t = 20 s

Speed of Piyush = Sp = 600/20 = 30 m/s

and Speed of Kaushik = 800/40 = 20 m/s

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A) 19 km | B) 15 km |

C) 12 km | D) 20 km |

Explanation:

Let total distance be **2D**.

He walks half distance i.e, (2D/2) = 'D' distance with **3 kmph** and

The next 'D' with** 6 kmph.**

Using formula,

**Time = Distance/speed**

(D/3) + (D/6) = 5

D =10 ,

Hence,** Total distance 2D = 20 kms.**

A) 60 kmph | B) 90 kmph |

C) 100 kmph | D) 120 kmph |

A) 24 | B) 28 |

C) 32 | D) 30 |

Explanation:

Difference in time taken = 4min = **1/15 hr**

Let the total distance covered by person be **D km**.

Then,

⇒ **D/40 – D/45 = 1/15**

⇒ 5D = 120

⇒ D = 24 km

∴ Distance covered by person is **24 km.**

A) 1 hour | B) 1 hour 30 min |

C) 2 hours | D) 2 hours 30 min |

A) 11.00 am | B) 12.30 pm |

C) 11.30 pm | D) 12.00 pm |

A) 100 km | B) 150 km |

C) 200 km | D) 250 km |