Time, Speed, Distance, and Unit ConversionDate: 7/30/96 at 11:46:41 From: Anonymous Subject: Time, Speed, Distance, and Unit Conversion If you were traveling in a car moving at a constant velocity of 44 mph for 50 minutes, how many kilometers would you have travelled? Thanks, Jerry Date: 7/30/96 at 13:7:19 From: Doctor Paul Subject: Re: Time, Speed, Distance, and Unit Conversion We begin by converting mph to kph and minutes to hours: 44 miles 5280 feet 12 inches 2.54 cm 1 meter 1 km ------- x ------------ x ---------- x ------- x -------- x ----- hour 1 miles 1 foot 1 inch 100 cm 1000 m Note that all I am really doing is multiplying by one. 5280 feet and 1 mile are equivalent. Also note that all of the units will cancel except km / hr multiply it out: 44 mph = 70.81 kph 50 minutes 1 hour ----------- x ---------- 1 60 minutes multiply it out: 50 minutes = .83 hrs So we move 70.81 kilometers .83 hours ---------------- x ----------- = 1 hour 1 multiply it out, solve, cancel out the hour unit and you get 58.77 kilometers. -Doctor Paul, The Math Forum Check out our web site! http://mathforum.org/dr.math/ |
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