Question 1102897
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The other tutor's answer is perfectly good; here is another way to solve the problem that I personally think is easier....<br>
The time is the same for the two planes, so the ratio of the speeds will be the same as the ratio of the distances covered.
The ratio of the distances covered is 540:360 = 3:2, so the ratio of the speeds is 3:2.<br>
With the ratio of speeds being 3:2, represent them with 3x and 2x.  Then, since the difference in speeds is 60mph,
{{{3x-2x = 60}}}
{{{x = 60}}}
The speeds of the two planes are 3x=120mph and 2x=120mph.