book Maths Puzzle Numerical Ability

Please help me solve this problem:

If Car A were traveling at 40 miles per hour and Car B was traveling 150 feet behind Car A at 45 miles per hour, how many seconds will it take before Car B runs into Car A?

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directions:solve problems using two unknowns and asystem of two equations.

one number is 7 more than another number. the sum of these two numbers is 101. what are the numbers? A motorcycle breaks down and the rider has to walk the rest of the way to work. The motorcycle was traveling at 45 mi/h, and the rider walks at a speed of 6 mi/h. The distance fro