Question 634002
river - 5 mph
boat x

upstream speed = x-5
downstream = x+5

1.2/(x-5)-1.2/(x+5)= 1/2

LCD = 2(x-5)(x+5)

multiply equation by LCD
2*1.2(x+5) - 2*1.2(x-5) = 1/2 * 2*(x-5)(x+5)

2.4x+12-2.4x+12=x^2-25
24+25=x^2

49=x^2

x +/- 7 

speed of boat = 7 mph