They don't. It would not be feasible to do this. 100 seconds is one minute forty seconds. One hour would be 3,600 seconds.
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1500 mph is a measure of speed and whereas a second is a measure of time. The two measure different things and so cannot be converted from one to the other. There are no seconds in 1500 mph.
An hour has 3600 seconds. 10 seconds is 1/360 of an hour.
3,600 seconds in a hour
Since one hour = 3600 seconds, 7.045 seconds =.0001957 of an hour.
There are 5,400 seconds in an hour and a half.