=60/(3/4)
=80 km/h
Time required to drive 1 km.
=(3/4)/60
=3/240
= 1/80 (hours)
===============
4/5 divided by 3/ 10 equals 8/3 km/h.
You can walk 8/3Km less than 3Km in an hour.
So you can't walk 3 kilometers.
If my answer is correct, please give me a high score. Ha ha laugh