Question 1086094
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Tom walks at an average speed of 8km/hr. The distance [d(t)] his walks can be represented by the function d(t)=8t where t is the time in hours. 


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a) Calculate d(4.25)                               d(4.25) = 8*4.25 = 34 km.   (Simply substitute t= 4.25 into the formula d(t) = 8t).

b) Calculate t if he walks a distance of 4 km.     8*t = 4  ====>  t = {{{4/8}}} = {{{1/2}}} of on hour = 30 minutes.
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Solved.