Question

One car traveling at 30 mph and another car traveling at 40 mph left from the same place at the same time and traveled in opposite directions. How long will it take before the cars are 630 miles apart?One car traveling at 30 mph and another car traveling at 40 mph left from the same place at the same time and traveled in opposite directions. How long will it take before the cars are 630 miles apart?

Answer 1

i believe it would be 7 miles

Answer 2

We are given that the first car is travelling at the speed of 30 mph.

Now let us say it left at time x hours.

Distance covered by first car = speed * time = 30*x miles = 30x miles

We are also given that the second car is travelling at the speed of 40 mph.

This car is travelling in opposite direction but left at the same time.

Let us say time is x hours.

Distance covered by second car = 40x miles.

Now we are given the total distance between the two cars as 630 miles.

So total distance = Distance covered by first car+Distance covered by second car

$630 = 30x +40x$

$630 = 70x$

x=9

Answer: The two cars will be 630 miles apart after 9 hours.