Multiple choice

A motorboat takes 2 hours to travel a distance of 9 km. down the current and it takes 6 hours to travel the same distance against the current. What is the speed of the boat in still water in km./hr.? एक मोटरबोट बहाव की दिशा में 9 किमी. की दूरी तय करने में 2 घंटे लेती है और बहाव की विपरीत दिशा में वही दूरी तय करने में 6 घंटे लेती है। स्थिर पानी में बोट की चाल किमी./घं. में कितनी है?

  1. 3

  2. 2

  3. 1.5

  4. 1
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A Correct answer
Explanation

Downstream speed = 9/2 = 4.5 km/hr, upstream speed = 9/6 = 1.5 km/hr. Let boat speed be b and current speed be c. Then b + c = 4.5 and b - c = 1.5. Adding these equations gives 2b = 6, so b = 3 km/hr. This is the speed of the boat in still water.

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