- #1
elsmith2
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a multiple choice question from one of my tests:
A race car covers the first lap of a two lap race with an average speed of 90mi/hr. With what speed must the driver average for the second lap so that the average speed for the two laps is 180mi/hr?
A)90mi/hr
B)180mi/hr
C)270mi/hr
D)360mi/hr
E)None of these
I chose C (seemed logical to me, disregarding the fact that race cars don't go 270mi/hr-not the ones that do laps anyways,: (90+270)/2 = 180), but it was wrong. Why? Whats the right answer?
Ed
A race car covers the first lap of a two lap race with an average speed of 90mi/hr. With what speed must the driver average for the second lap so that the average speed for the two laps is 180mi/hr?
A)90mi/hr
B)180mi/hr
C)270mi/hr
D)360mi/hr
E)None of these
I chose C (seemed logical to me, disregarding the fact that race cars don't go 270mi/hr-not the ones that do laps anyways,: (90+270)/2 = 180), but it was wrong. Why? Whats the right answer?
Ed