4 tractors working together can plough a field in 12 hours how long will it take 6 tractors to plough a field of the same size, if all tractors work at the same rate?

4 tractors working together can plough a field in 12 hours how long will it take 6 tractors to plough a field of the same size, if all tractors work at the same rate?

A 6hrs

B 10hrs

C 8 hrs

D 9hrs

Solution

Correct Answer: Option C

4 tractor takes 12 hr 1 " " 12x4 hr 6 " " 12 x 4 /6 = 8 hr