alleryA makes 6 units/h; B makes 4 units/h and starts 2 h later. When are 92 units done, from A's start?
A10 h
B9 h
C11 h
D12 h
Answer & Solution
Correct answer: A. 10 h
If A works t hours, 6t + 4(t − 2) = 92 gives t = 10 hours.
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