Answers

  • Brainly User
2014-03-01T13:16:58+05:30
The anwer is  \frac{5}{3}
they wil finish at time 3:40 pm
EXPLANATION:
john does  \frac{1}{4} in an hour
Jack does  \frac{1}{5} in an hour
therefore
 \frac{1}{4}+( \frac{1}{4} + \frac{1}{5} )t=1
solve it
u get t= \frac{5}{3}
which is 100 minutes
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