Quote:
A worker can load 1 full truck in 6 hours. A second worker can load the same truck in 7 hours. If both workers load one truck simultaneously while maintaining their constant rates, approximately how long, in hours, will it take them to fill 1 truck?
A. 0.15
B. 0.31
C. 2.47
D. 3.23
E. 3.25
The combined rate of the two workers is 1/7 + 1/6 = 6/42 + 7/42 = 13/42.
Since time is inverse of rate, it will take 42/13 = 3 3/13 = 3.23 hours.
Answer: D
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