1. If 9 engines consume 24 metric tonnes of coal, when each is working 8 hours a day; how much coal will be required for 8 engines, each running 13 hours a day, it being given that 3 engines of the former type consume as much as 4 engines of latter type.

a. 22 metric tonnes.

b. 27 metric tonnes.

c. 26 metric tonnes.

d. 25 metric tonnes.

.9857.