Q:

A) 4 mile/hr | B) 6 mile/hr |

C) 2 mile/hr | D) 5 mile/hr |

Answer: B) 6 mile/hr

Explanation:

Explanation:

Let the speed of river and boat be 'r' m/min and 'b' m/min.

so relative speed in upstream (b-r)m/min and in downstream (b+r)m/min.

Now in upstream distnce covered in 5 min is 5(b-r)miles

so total distnce covered => 1 + 5(b-r)miles in upstream

In downstream distance covered in 5min is 5(b+r)miles

Now 1 + 5(b-r) = 5(b+r)

1+5b-5r = 5b+5r

1 = 10r

r = 1/10 mile/min => 6 mile/hr.

Q:

A) 59, 97 | B) 348, 296 |

C) 3025, 4920 | D) 114, 213 |

0
118

Q:

A) 55 km/hr | B) 45 km/hr |

C) 48 km/hr | D) 50 km/hr |

0
120

Q:

A) 275 km | B) 325 km |

C) 300 km | D) 225 km |

0
162

Q:

A) 150/11 | B) 120/7 |

C) 130/11 | D) 150/13 |

2
150

0
137

Q:

A) 17.5 km | B) 24.5 km |

C) 21 km | D) 28 km |

0
306

Q:

A) 1 hour | B) 1 hour 30 minutes |

C) 2 hours 30 minutes | D) 2 hours |

0
158

Q:

A) 2.07 ms-1 | B) 2.60 ms-1 |

C) 3.67 ms-1 | D) 2.67 ms-1 |

0
167