Question

Two cars start at the same point and simultaneously drive in opposite directions.

The speed of the first car is s miles per hour. The speed of the second car is 5
miles per hour less than the speed of the first car.
How far apart are the cars 1.5 hours after they start moving?

Answer 1

After 1.5 hr, they are 3s - 7.5 mi away.

Explanation:

Forming the expression,

→ 1.5 × (s + s - 5)

Now the required solution will be,

→ 1.5 × (s + s - 5)

→ 1.5 × (2s - 5)

→ 1.5(2s - 5)

→ 3s - 7.5

Hence, answer is 3s - 7.5 miles.

Answer 2

• 3s - 7.5 miles

Explanation:

Given

• The speed of car1 is s,
• The speed of car2 is 5 less than s,
• Time is 1.5 hrs.

Solution

Distance equation:

• Distance = speed * time

If cars move in opposite directions their speeds add up, then the distance between them after 1.5 hours is:

• (s + s - 5)*1.5 =
• (2s - 5)*1.5 =
• 3s - 7.5