book Maths Puzzle Numerical Ability

A train traveling at 60 kph covers a given distance in 3 hours. By how many kilometers per hour must its rate be increased so that it will travel the distance in one-half hour less time?

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book Other Question
the value of a building lot this year is $78,000. this is three times its value 18 years ago. find its value 18 years ago. The sum of two consectutive positive integers is 11 less than their product.
find the integers.