Anybody any good at maths?

Discussion in 'General Cycling Discussions' started by Globalti, 22 Aug 2012.

  1. Globalti

    Globalti Legendary Member

    Help me with this: last night Ben and Alex went down to the park where they met John and Mary. They knocked John and Mary over and stole their bikes, riding off laughing to each other and exclaiming "wasn't that fun!"

    They rode the bikes up some really big hills, nearly a thousand feet of climbing. It was 9.4 miles to the top and when they got there Ben saw that they had averaged 12.4 miles an hour. Going back was nearly all downhill and when they got back to the park they had ridden 23.2 miles in 1 hour and 28 minutes at an overall average of 15.6 mph. They still agreed they had had fun but their legs felt tired.

    What was Ben and Alex's average speed from the top of the hill back to the park?
  2. hoopdriver

    hoopdriver Veteran

    East Sussex
    How come it was longer on the way back?
  3. buddha

    buddha Veteran

    Ascent time = 9.4 miles /12.4 mph = 0.758 hours
    Descent time = (1 + 28/60) - 0.758 = 0.709 hours
    Descent distance = 23.2 - 9.4 = 13.8 miles
    Descent speed = 13.8 / 0.709 = 19.5 mph
    Dragonwight likes this.
  4. redcard

    redcard Über Member

    All signs suggest a computer malfunction.
  5. compo

    compo Veteran

    The road was an anti-clockwise circular route up the climb, so coming down in a clockwise direction would put the riders on the outside lane , hence further to cycle.
  6. OP

    Globalti Legendary Member

    D'oh! What a silly question! They didn't come back the same way they went out!

    Anyway Buddha gets the prize, step up and receive your gold star!
  7. Night Train

    Night Train Maker of Things

    Greater Manchester
    Who cares what their speed was?
    And where are the Police when you need them?

    Ben and Alex should be strung up in the park as a warning to others! Bleeding bike thieves!:cursing:

    Did John and Mary get their bikes back?

    I take it that was not a true story.:scratch:
  8. OP

    Globalti Legendary Member

    Some of it was true!
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