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A) 8 |

B) 10 |

C) 4 |

D) 6 |

Correct Answer:

D) 6 |

Description for Correct answer:

Let rate upstream be kmph

Then, rate downstream = 2x kmph

\( \Large \therefore \) Rate of current

\( \Large \frac{1}{2} (2x - x) = \frac{x}{2} \ kmph \)

\( \Large \therefore \frac{x}{2} = 2 => x = 4 \)

\( \Large \therefore \) Rate upstream = 4 kmph

Rate downstream = 8 kmph

\( \Large \therefore \) Rate in still water

= \( \Large \frac{1}{2} (8 + 4) = 6 \ kmph \)

Let rate upstream be kmph

Then, rate downstream = 2x kmph

\( \Large \therefore \) Rate of current

\( \Large \frac{1}{2} (2x - x) = \frac{x}{2} \ kmph \)

\( \Large \therefore \frac{x}{2} = 2 => x = 4 \)

\( \Large \therefore \) Rate upstream = 4 kmph

Rate downstream = 8 kmph

\( \Large \therefore \) Rate in still water

= \( \Large \frac{1}{2} (8 + 4) = 6 \ kmph \)

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