Akanksha can type 20 pages in 5 minutes. Mary can type 10 pages in 10 minutes. Working together, how many pages can they type in 30 minutes?
Explanation:
Akanksha can type 20 pages in 5 minutes, hence she can type 20/5 = 4 pages per minute
Mary can type 10 pages in 10 minutes, hence she can type 10/10 = 1 pages per minute
Together, Akaksha and Mary can type 4 + 1 = 5 pages per minute.
∴ In 30 minutes they can together type = 5 × 30 = 150 pages
Alternately, We know that Akanksha can type 20 pages in 5 minutes.
Hence, number of pages she can type in 30 mins = 20/5 × 30 = 120
We know that Mary can type 10 pages in 10 minutes
Hence, number of pages she can type in 30 mins = 10/10 × 30 = 30
Total number of pages typed by both in 30 minutes = 120 + 30 = 150
Hence, option (e).
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