Question
P can construct a robot individually in 20 hours, while
Q requires 40 hours to complete the same task. If they collaborate, how many hours will it take them to assemble 6 robots?Solution
Time taken by both to build one robot = 1/ {1/20 + 1/40} = 1/(3/40) So, time taken by both to build 6 robots = 6 Ă (40/3) = 80 hours
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