Question 481126
let him walk x km
so he trucked 157-x km

time walked = x/4
time trucked = (157-x)/30

Total time = 10 hours

x/4 + (157-x)/30 =10

LCD = 60

multiply the equation by LCD
15x+(157-x)*2 = 600
15x+314-2x=600
13x=600-314
13x=286
x=22 the distance walked
speed walked = 4 kph
time walked = 22/4 = 5.5 hours

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