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Thursday, October 20, 2016

Primary maths


A boy is using a flight of stairs. He walks some steps and runs 6 steps for 65s. Then he does it again by walking some steps and running 14 steps for 41s. How long will he take to walk up the flight of stairs.
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1 comment:

Eric Ho said...

Solution:

Time taken to run 1 step = (65-41) / (14-6) = 3 sec
Time taken to walk the steps = 65 + (6 * 3) = 83sec
or
Time taken to walk the steps = 41 + (14 *3) = 83sec

October 20, 2016 at 4:09 PM

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