Mathematics
NULL
Medium
Question
A man swims 72 km downstream and 45 km upstream, each in 9 hours. What is the speed of the current?
A
3 kmph
B
1.5 kmph
✓ Official correct answer
C
13 kmph
D
6.5 kmph
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
3 kmph
No member explanations yet for this option.
B
1.5 kmph
No member explanations yet for this option.
C
13 kmph
No member explanations yet for this option.
D
6.5 kmph
No member explanations yet for this option.
Explanation
Down = 8 km/h; up = 5 km/h. Current = (8−5)/2 = 1.5 km/h.