exam Maths Puzzle Numerical Ability

A sailboat can travel 60 miles, upstream in the same time it takes to travel 100 miles downstream. If the speed of the boast in still water is 20 miles per hour, what is the speed of the current?

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1/2 + 2/x = 3/4 I need help in solving this equation

2(x+3) = -4(x+1)

This is how I started:
2x+6 = -4x - 4
2x + 6-6 = -4x-4-6
2x = -4x - 2
2x + 4x = -4x+4x-2
6x = 2
(my answer is incorrect)