Acar traveled a distance of 126 miles in 3 hours. traveling at the same speed, what distance would this car travel in 7 hours?

54 miles

63 miles

252 miles

294 miles

First method: by the rule of three:
126 miles3 hours
x7 hours

x=(126 miles * 7 hours) / 3 hours=294 miles.

294 miles.

Second method:
Speed=distance/ time           ⇒distance=speed x time

We calculate the speed of the car:
Speed=126 miles/3 hours= 42 miles/hour.

Data: 
Speed=42 miles/hour
time=7 hours

Distance=speed x time
Distance=(42 miles/hour)(7 hours)=294 miles

294 miles.