book Maths Puzzle Numerical Ability

One car travels 40 km/hr faster than another. while one travels 150 km the other goes 350km. Find the speed of the slower car.
___km/hr
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book Other Question

the sum of two numbers is 25. 12 less than 4 times one number is 16 greater than 2 times the other number. What is each number? A racetrack measures 5 miles long. If an automobile completes the track in exactly 4 minutes, what is its average rate of speed in miles per hour?