Two carpenters, working in the same pace, can build 2 desks in two hours and a half. How many desks can 4 carpenters build in 5 hours? Choose the correct choice from the following choices:
A) 2.4.
B) 3.6.
C) 4.2.
D) 8.
E) 6.4
W = 2 desks   T = 2.5 hrs   Rate of 2 carpenters = 2×R   Rate = work done/ time   2xR = 2/2.5   R = 1/2.5 = 2/5 (this is the rate of each carpenter)   Work done by 4 carpenters in 5 hrs = 4 × rate of each carpenter x time = 4× 2/5 × 5= 8 desks   8. is the correct answer.
<result>D</result>
Two carpenters, working in the same pace, can build 2 desks in two hours and a half. How many desks can 4 carpenters build in 5 hours?