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Best Answer
60 sec = 1 min
60 min = 1 hr
40 sec = 40/60 min = 2/3 min
2 min 40 sec = 22/3 min = 8/3 min
→ 2 min 40 sec = 8/3 ÷ 60 hr
= 8/3 x 1/60 hr
= 2/45 hr
speed = distance ÷ time
= 15/8 mi ÷ (2 min 40 sec)
= 13/8 mi ÷ (2/45 hr)
= 13/8 x 45/2 mi/h
= 585/16 mph
= 369/16 mph
≈ 36.5 mph
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