Question

If a boy can make 10 paper planes in 30 mins, then how many paper planes can he make in 2 hours?

• A. 35 paper planes
• B. 40 paper planes
• C. 50 paper planes
• D. 20 paper planes

Answer 1

The correct option is B 40 paper planes

Given, the number of paper planes that can be made in 30 mins = 10
$\therefore$ the number of paper planes that can be made in 1 min
$=\frac{10}{30}=\frac{1}{3}$

So, the number of paper planes that can be made in 2 hours (2 $\times$60 = 120 mins)
$=\frac{1}{3}\times 120$
$=40\text{paper planes}$