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Just need you to check answer

  1. Sep 12, 2007 #1
    A popular website states that a 130 pound person will burn 472 Cal/hr bicyling and 649 Cal/hr rockclimbing. Alexandra (who happens to be 130 pound) has decided to start a training program bicycling for 45 minutes, 3 times/week as well as rockclimbing every saturdays. How many calories does Alexandra burn in 8 weeks of training?


    10170 cal Burnt in 8 weeks of training

    Please check if this is the correct answer Thanx alot

    im not asking for much :D
  2. jcsd
  3. Sep 12, 2007 #2
    Well. I worked it out and got 12,390 cal burnt. Here is my work:

    45 minutes=3/4 hour
    472 Cal/hr=354 Cal/45 min
    3 times/week for 8 weeks=24 of the 45 minute sessions

    Rock climbing:
    649 Cal/hr=486.75 Cal/45 min
    1 session a week= 8 of the 45 minute sessions

    TOTAL: 8,496+3,894=12,390

    (This is assuming that the rock climbing on saturdays is for 45 minutes.)
  4. Sep 12, 2007 #3

    oook thnx i just spotted my mistake... i did 354 x 8 instead of 24 and she is rock climbing for 1.5h thnx alot
  5. Sep 12, 2007 #4
    But for how much time does he do rock climbing? You did specify that he does bicycling for 45 mins, 3 times a week. I'm assuming he does rockclimbing for 45 mins every saturday.

    For Bicycling

    472 Cal/hr, Therefore he'll burn 354 Cal/45min.

    In a week, he does that 3 times. So in 8 weeks, 24 times.

    Total calories burnt = 24*354 = 8496

    For Rockclimbing

    649 calories in 60 mins, 1947/4 cals per 45 mins.

    He does that 8 times in 8 weeks,

    Calories burnt = 8*1947/4 = 3894

    Grand total = 3894 + 8496 = 12390

    Ops, didn't see the previous reply!

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