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A boat can move upstream at 25 kmph and downstream at 35 kmph, then the speed of the current is_________?

Correct answer: A. 5 kmph

  • A. 5 kmph
  • B. 10 kmph
  • C. 30 kmph
  • D. 15 kmph

Explanation

For a boat, downstream speed equals boat speed plus current speed, while upstream speed equals boat speed minus current speed. Therefore, current speed = (35 km/h - 25 km/h) ÷ 2 = 5 km/h. The likely trap is 10 kmph, which is the whole difference between downstream and upstream speeds, not the current alone.

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About Time, Speed and Distance

Problems relate distance, speed and time through the formula distance = speed × time, including unit conversion, average speed, relative speed and motion in opposite or the same direction. Questions may involve trains, boats and streams, where the effective speed changes, so average speed must not be confused with the simple average of two speeds.

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