Question 1118466
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For the same amount of time, the ratio of distances traveled is 90/:75 = 6:5.<br>
Since the times are the same, the ratio of the speeds is also 6:5.<br>
The two speeds we are looking for are two numbers with a difference of 6 that are in the ratio of 6:5.<br>
That is easily done with simple mental arithmetic.<br>
In the ratio "6:5", the difference between the two numbers is 1.  To get the difference of the two numbers to be 6, simply multiply both numbers in the ratio by 6.<br>
6:5 = 36:30<br>
The two speeds are 36 mph and 30 mph.