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A boat goes 24 km upstream and 36 km downstream in 6 hours, and 36 km upstream and 24 km downstream in 6.5 hours. What is the speed of the…

1856Medium DSSSB TGT Computer Science 0 replies 1 views
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A boat goes 24 km upstream and 36 km downstream in 6 hours, and 36 km upstream and 24 km downstream in 6.5 hours. What is the speed of the stream?

  • A1 km/h
  • B3 km/h
  • C2 km/h
  • D4 km/h
Correct answer: C

Explanation

Solving 24/u + 36/d = 6 and 36/u + 24/d = 6.5 gives u = 8 km/h and d = 12 km/h, so the stream's speed is (12 − 8)/2 = 2 km/h.
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