Multiple choice

A man rows upstream a distance of 9 km or downstream a distance of 18 km taking 3 hours each time. Find the speed of the boat in still water. एक आदमी उर्ध्वप्रवाह में 9 किमी की दूरी या अनुप्रवाह में 18 किमी. की दूरी तय करने में 3 घंटे लगते है तो नाव की शान्त जल में चाल ज्ञात कीजिए |

  1. 3.5 kmph/(किमी./घंटा)

  2. 4.5 kmph/(किमी./घंटा)

  3. 5.5 kmph/(किमी./घंटा)

  4. 6.5 kmph/(किमी./घंटा)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Upstream speed = 9/3 = 3 kmph, downstream speed = 18/3 = 6 kmph. Boat speed = (3 + 6)/2 = 4.5 kmph.

Keep practicing — related questions