2015 · Q20
A man rows downstream 32 km and 14 km upstream, and he takes 6 hours to cover each distance. What is the speed of the current?
Elementary MathematicsTime, Speed and Distance
- A0.5 km/hr
- B1 km/hr
- C1.5 km/hr
- D2 km/hr
Explanation
Downstream speed = 32/6 = 16/3 km/h; upstream speed = 14/6 = 7/3 km/h. Speed of the current = (16/3 − 7/3)/2 = 1.5 km/h (option C).