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 :

  1. 3.75 km

  2. 4 km

  3. 4.8 km

  4. 4.25 km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let distance be d km. Speed downstream = 5+3 = 8 km/h. Speed upstream = 5-3 = 2 km/h. Time downstream = d/8 hours. Time upstream = d/2 hours. Total time: d/8 + d/2 = 3 hours. Solving: d/8 + 4d/8 = 3, so 5d/8 = 3, giving d = 24/5 = 4.8 km. Option C matches.

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