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let the speed of the car be xkm/h during the up journey…
total distance travelled ill remain same ,ie
7*x=(x+12)*5
or,x=30 km/hr
so distance travld= 7*30=210;
Let the speed is X km per hour
so total journey = 7 x X = 7X
so 7X = 5(X+12)
7X – 5X = 60
X = 30
So, Total journey = 7 x 30 = 210 k.
30 x 7 = 210 k.
(30+12) = 42 x 5 = 210 km.
d=7s—–equation 1
d=5(s+12)
7s=5(s+12)
7s=5s+60
2s=60
s=30
from equation 1
d=7*30
d =210km