Question 842665
What is the normal time, if 65 mph?
RT=D
T=D/R
T=15/65 hours


Five Minutes Less Time:
What speed?
R=D/t and you want {{{t=15/65-1/12}}}, because five minutes is 1/12 hour
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{{{R=15/((15/65-1/12))}}} mph
Using decimalized numbers, {{{R=15/0.147436=highlight(102)}}} mph