Question 378772
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Let John walk for w km in 1 hour.
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The wife in 1 hour travels 60 km.
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The distance to station is 60+w km.
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time taken to & fro =t
Everyday the time taken for them = 2(60+w)/60 =t................1
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Today she drove for 1 hour
so she drove 60 km.
to day they reached 12 minutes early. = 1/5 hour
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today distance traveled = 120
speed = 60 km/h
time = 120/60 = t-1/5
2= t -1/5 
multiply by 5
10= 5t -1
5t=11
/5
t = 11/5 
plug this value in equation 1
2(60+w)/60 =t
2(60+w)/60 =11/5
multiply by 5 
2(60+w)*5/60 = 11*5/5
2(60+w)/12= 11
2(60+w)=132
60+w= 132/2
60+w=66
-60
w= 66-60
w= 6 .. John walked for 6 km.
distance to station = 60+6 = 66 km.
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