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### Grade 8 - Mathematics9.10 Problems on Time and Work - III

 Directions: Solve the following problems. Also write at least 5 examples of your own.
 Q 1: Jacob can construct 1/3 of wall in 20 days. Cole can construct 2/3 of wall in 30 days. Jack can construct 1/2 of wall in 15 days. If all the three work together, in how many days will they construct 13/9 of the wall.22 days20 days18 days16 days Q 2: 8 men and 12 women can do a piece of work in 9 days. 10 men and 20 women can do the same work in 6 days. How long will 5 men and 15 women take to do it.9 days10 days11 days13 days Q 3: John, Peter and Matt can do a piece of work in 10 days. Peter and Matt can do it in 20 days. Matt alone can do it in 30 days. In how many days John and Matt can do the work together.10 days12 days13 days11 days Q 4: A can do a piece of work in 8 1/2 days. A works for 2 days B joins A. They work for one day, the capacity of B is double the capacity of A. On the 4th day the work is completed by A and B with the help of a boy. In how many days the boy can do the work.15 days17 days16 days18 days Q 5: 12 men and 8 women can do a piece of work in 16 days. 13 men and 4 women can do it in 18 days. How long will 3 men and 12 women take to do it.23 days24 days25 days22 days Q 6: 8 men and 14 women can do a piece of work in 8 days. 10 men and 20 women can do the same work in 6 days. How long will 3 men and 11 women take to do it.16 days15 days17 days18 days Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!