Multiple choice

The speed of boat when travelling downstream is 32 km/h, whereas when travelling upstream it is 28 km/h. What is the speed of the boat in still water? धारा के साथ यात्रा करते समय नाव की गति 32 किमी / घंटा है, जबकि धारा के विपरीत यात्रा करते समय यह 28 किमी / घंटा है। स्थिर जल में नाव की गति ज्ञात कीजिये?

  1. 28

  2. 32

  3. 30

  4. 34

  5. 35
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let boat speed = b and stream speed = s. Downstream: b + s = 32, upstream: b - s = 28. Adding the equations gives 2b = 60, so b = 30 km/h. The answer is neither 28 (downstream speed) nor 32 (upstream speed).

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