Multiple choice

The speed of a water boat along the current is 15 km/hr and against the current is 12 km/hr. Find the speed of the current in m/sec.

  1. $0.526 m/sec$
  2. $2 m/sec$
  3. $0.416 m/sec$
  4. $5 m/sec$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When boat moves with current (downstream), its effective speed is boat speed + current speed. Against current (upstream), effective speed is boat speed - current speed. Speed of current = (downstream speed - upstream speed) / 2 = (15 - 12) / 2 = 1.5 km/hr = 0.416 m/sec.

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