exam Maths Puzzle Numerical Ability

A river has a steady current. A boat travels 30 mph over still water. If a trip 85 miles downstream and back takes 10 hours, then what is the speed of the current?

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exam Other Question

Write the equation of a line whose slope is 6 and whose y intercept is -3. The attendance at a baseball game was 400 people. Students tickets cost $2 and adult tickets cost $3. Total ticket sales were $1050. How many tickets of each type were sold.