Q:

A) 8 m/h | B) 5 m/h |

C) 7 m/h | D) 6 m/h |

Answer: B) 5 m/h

Explanation:

Explanation:

As the distance travelled is constant, the time taken is inversely proportional to speed.

Let **'u'** be the speed of the current and **'v'** be the speed of the boat.

Speed of the boat downstream = **v + u** & upstream = **v - u**

=> v+u/v-u = 30/20 => v/u = 5 => v = 5u

=> v + u = 6u = 10/20/60 miles/hr

=> 6u = 30 m/h

=> u = **5 m/h**

3
713

4
646

1
516

4
690

0
642

1
1711

Q:

A) 2(2 + √17) | B) 3(2 + √17) |

C) 2(4 + √15) | D) 3(4 + √17) |

3
1375

Q:

A) 0.20 Hz | B) 625 Hz |

C) 250 Hz | D) 100 Hz |

2
1316