Exercise 10.1
1. A alone can finish a piece of work in 12 days and B alone can do it in 15 days. If both of
work at it together, how much time will they take to finish it?
Answers
Answered by
7
Answer:
A's 1 day work =121
A's 4 day work =124
Remaining work =1−124=128=32
B's 1 day work =151
A and B can finish the work in =(12+15)×32
=27×32
=18
Hence A and B will together finish the work in 18 days.
Answered by
12
Explanation:
in 12 days A can do 1 work
in 1 day A can do 1/12 work
in 15 days B can do 1 work
in 1 day B can do 1/15 work
if they both work together = 1/12+1/15
= (5+4)/60
= 9 /60
time taken for 1 work = 1÷9/60
= 1×60/9
=60 /9 days
= 6 2/3 days ans
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