Answer / manas

let car speed =x
after 7 hour journey the car cover all distance
means Distance= Speed*time=7x km

in the return journey that car increase speed 12km/hour
cover same distance in 5 hours
maans distance=(x+12)*5 km

both case distance is same
7x=(x+12)*5
=>7x=5x+60
=>2x=60
=>x=30km/hour

speed=30km/hour
distance=30*7=210km

Answer / sabarish

let d distance and s be speed.

d/7 = x and d/5 = x+12

solving we get d=210.

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