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How would i solve the attached motion problem using a chart ?

Since one is going at 40 knots and the other is travelling in the opposite direction at 30 knots, the distance between them is increasing by 40+30 = 70 knots per hour.

The equation for this distance is y = 70x, where is is hours and y is nautical distance.

To answer when y is 350 gives 350 = 70x, so divide both sides by 70.

This gives 350/70 = x, so x is 5 hours.

To use a chart, put each hour on the x axis and every 10 miles on the y axis.

Graph y = 7x. When x is 5, y can be seen to be 35. Since this is in 10 mile increments,

35*10 = 350.

Algebra

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