I need help on this problem A student driving home for the holidays starts at 8:

Question

I need help on this problem A student driving home for the holidays starts at 8:00 am tomake the 675-km trip, practically all of which is on nonurbaninterstate highway. If she wants to arrive home no late than3:00pm, what must be her minimum average speed? Will she have toexceed the 65-mi/h speed limit? I need help on this problem A student driving home for the holidays starts at 8:00 am tomake the 675-km trip, practically all of which is on nonurbaninterstate highway. If she wants to arrive home no late than3:00pm, what must be her minimum average speed? Will she have toexceed the 65-mi/h speed limit?

Explanation / Answer

. 01.   1.0 kilometers = 0.62137119224miles      ;   Unitconversion 02.   1.0 miles = 1.609344kilometers      ;   Unitconversion . 03.   (675 km)*(1 mile / 1.609344 km) = 419.4256miles 04.   s = average speed of vehicle = (419.4miles)/(7 hours) = 59.91794mph 05.   t = (419.4 miles)/(65 miles/hour) = 6.4527hours = 6 hours 27 minutes 06.   No, the student will not have to exceed 65 mphas long as the cumulative stops for gas and biological breaks doesnot exceed 33 minutes and the student sets the cruise control to 65mph during the time s/he is on the interstate. .

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