Question

A car travels 120 miles in 3 hours, at a constant speed. How long will it take to travel 200 miles?

Answer 1

car travels in one hour
$= 120miles \div 3hour \\ = 40miles$
car travels distance of 200miles in
$200miles \div 40miles \\ = 5hours$

Answer 2

by direct variation we can solve
distance in 120=3
distance in 200=5