Answer Posted / suchi teegala

speed = distance / time

let the distance be x
during forward journey ,
time is given as 7hrs
and let the speed be y
therefore , y=x/7
during return journey
since the distance travelled is same in both directions
, here also we will consider the distance as x
now the speed is increased by 12kmph so the speed is y+12
now the time taken is 5 hrs
therefore , y+12=x/5
on solving the both equations
x=7y and
5y+60=x
we get x as 210 km
total distance - distance in forward journey + distance in
return journey
=x+x=2x
i.e., =210+210
=420 km is the answer

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