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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please help me solve 4/5x=5/4

i know i need to flip the 4/5x but i keep getting confused i think the answer is
1.5 if it is im just confused on the check 9. approximate the point of the intersection of the graphs og f and g. then solve the equation f(x)=g(x) algebraically. f(x)=log3x g(x)=0