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Hi,
A person leaves home a 8:00 am and drives to a destination at a rate of 40 miles per hour.
The person returns at a rate of 25 miles per hour and arrives at 2:30 pm.
Total time 6.5 hr (Assuming no stopping time)
D/r = t
D/40mph + D/25mph = 6.5
65D = 6.5(40*25)
D = 6.5(40*25)/65
D = 100mi