Question 380163
let the distance he walks be x
speed of walking = 4 kph
time walking = x/4 hours
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t=d/r
d=4x
r=60 kph
time  driven = x/60 hours
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rest = 20/60 = 1/3 hours
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time walk + time drive + rest = 1 h 15 mins (= 1 1/4 hour = 5/4 hours)
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x/4 + x/60 + 1/3 = 5/4
- 1/3
x/4 +x/60 = 5/4-1/3
x/4+x/60 = (15-4)/12
x/4+x/60 = (11)/12
LCD = 60
(15x+x)/60 = 11/12
cross multiply
12*16x=660
192x=660
/192
x=660/192
x= 3.44 km the distance he walked.
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m.ananth@hotmail.ca