Marco can build a computer twice as fast as Cliff. Working together, it takes them 5 hours. How long would it have taken Marco w
orking alone?
1 answer:
Answer:
7.5 hours
Step-by-step explanation:
Let Marco's speed be M
Cliff's speed be C
M = 2C
Combined speed:
M + C
2C + C = 3C
3C = W/time
3C = W/5
W = 15C
2C = 15C/time
Time = 15/2 = 7.5 hours
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