Book Maths Puzzle Time Distance and Speed

Two planes leave an airport, traveling in opposite directions. After 4 hrs, the planes are 4,600 miles apart. One plane is traveling 50 miles per hour faster than the other plane.

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Book Other Question

At the time they took office, Joe and Tom were amongst the oldest governors. Joe was 4 years older than Tom. The sum of their ages was 134. Determine Joe's age and Tom's age at the How many pints of pure acid must be added to 5 pints of a 20% acid solution to yield a 50% acid solution?