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Math Help - travel and distance

  1. #1
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    travel and distance

    A dirt biker must circle a 5-mile track twice. His mean speed must be 60 mph. On his first lap, he averaged 30 mph. How fast must he travel on his second lap in order to qualify?
    a)30 m.p.h. b) 60 m.p.h. c) 90 m.p.h. d) 120 m.p.h. e) none of these

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  2. #2
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    Quote Originally Posted by sri340 View Post
    A dirt biker must circle a 5-mile track twice. His mean speed must be 60 mph. On his first lap, he averaged 30 mph. How fast must he travel on his second lap in order to qualify?
    a)30 m.p.h. b) 60 m.p.h. c) 90 m.p.h. d) 120 m.p.h. e) none of these
    Try and solve for v:

    60 = \frac{10}{\frac{5}{30} + \frac{5}{v}}.

    Better yet, substitute options (c) and (d) and see if one works - obviously (a) and (b) are wrong .....
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