exam Maths Puzzle Numerical Ability

The speed of a boat in still water is 24mph. If the boat travels 54 miles upstream in the same time that it takes to travel 90 miles downstream, find the speed of the current.

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exam Other Question

a two digit number whose units digit is two less than twice the tens digit If 5 times the first number plus three times the second number eaguals 47, and 10 times the first number minus 4 times the second number equals 54, what are the numbers?