exam Maths Puzzle Numerical Ability

With Current, a motorboat travels 60 mi in 3 h. Against the current, it takes 2h longer to travel 60 mi. Find the rate of the current.

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exam Other Question

the question states find line ab if a(2,3,4) + B(7,6,5)

I have tried pythagoream theorem but that didnt seem to work other than that i just could not understand the queston 6y + 8x = -432

i dont know how to find the x int. and the y int. or the slope in this problem