Problema Solution
Jack and Jill can complete a job in 5 hours. It takes Jack half an hour longer than Jill to complete the same job when each works alone. How long does it take each when they each work alone? Give the answer to two decimal places.
Answer provided by our tutors
let Jeck alone can do in x hrs and Jill in 2x hrs
1/x + 1/2x = 1/5
3/2x = 1/5
x = 15/2 = 7.5 hrs
jack can doin 7.5hrs and jill in 15 hrs