A can copy 75 pages in 25 hours. A and b together can copy 135 pages in 27 hours. In what time can b copy 42 pages? Select one:
a. 24 hrs
b. 36 hrs
c. 21 hrs
d. 18 hrs
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Answer:a write 75 pages in 25 hrs it means a write 3 pages in 1 hours
a& b together write 135 pages in 27 hr it means 5 pages pr hr
5 -3= 2. so b write 2 pages per hr. 42/2 =21 hours
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