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a man walked for some distance at 8km/h, and for an equal distance at 5km/h. the total time he took was 3 1/4 hours. find the distance he walked

• math -

time = distance/speed

d/8 + d/5 = 3.25 = 13/4
clear fractions by multiplying by 40:

5d + 8d = 130
13d = 130
d = 10

10km at 8km/h = 1.25 hrs
10km at 5km/h = 2 hours

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