An athlete's usual running speed in still air is 8 m/s.
On one windy day, the time he took to run 100m, running with the wind, was 6 2/3 seconds less than the time he took to run 100m, running against the wind.
a. Given that the speed of the wind that day was "w m/s", write down an expression in terms of w for the time he took to run 100m when running with the wind.
b. Form an equation in w and show that it reduces to w^2+30w-64=0
c. Solve the equation to find the speed of the wind

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i say b..

Ummm... It's not a multiple choice question, those are actually the questions, you know, a,b and c

(time taken to travel against wind) - (time take to travel with wind) = 6 2/3 seconds

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