Mathematics
Medium
Question
A tank can be filled by a pipe in 20 min. and by another pipe in 60 min. Both the pipes are kept open for 10 min. and then the first pipe is shut off. After this, the tank will be completely filled in__________?
A
10 min
B
20 min
✓ Official correct answer
C
30 min
D
40 min
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
10 min
No member explanations yet for this option.
B
20 min
No member explanations yet for this option.
C
30 min
No member explanations yet for this option.
D
40 min
No member explanations yet for this option.