Multiple choice

Speed of a boat is 5 km per hour in still water and the speed of the stream is 3 km per hour. If the boat takes 3 hours to go to a place and come back, the distance of the place is - स्थिर जल में एक नौका की चाल 5 किमी/घंटा है और धारा की चाल 3 किमी/घंटा है। यदि नौका को एक स्थान पर जाने और वापस आने में 3 घंटे लगते हैं तो उस स्थान की दूरी है -

  1. 3.75 km./किमी.

  2. 4 km./किमी.

  3. 4.8 km./किमी.

  4. 4.25 km./किमी.
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C Correct answer
Explanation

Boat speed in still water = 5 km/h, stream speed = 3 km/h. Downstream speed = 5 + 3 = 8 km/h. Upstream speed = 5 - 3 = 2 km/h. If distance is d km and total time is 3 hours: d/8 + d/2 = 3. Multiplying by 8: d + 4d = 24, so 5d = 24, giving d = 24/5 = 4.8 km. Therefore, the place is 4.8 km away.

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