Please solve this!!
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please help please
it's very urgent!!
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Answer:
20minutes
Step-by-step explanation:
A fill in 1min = 1/28 part
B fill in 1 min = 1/21 part
A and B together fill in 1 min = (1/28+1/21) = 1/12 part
1/12 part fill in 1 min
1/2 part fill in 1×12×1/2 = 6 min
Remaining part = 1-1/2 = 1/2 part
A fill 1/28 part in 1 min
A fill 1/2 part in 1×28×1/2 = 14 min
Total time taken = 6+14 = 20 minutes
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