Your question isn't clear but i guess it could be..
" you arrived in my class in 45 seconds after leaving maths class which is 90 meters away. how fast you traveled? "
here we have to find the speed.
we know that speed = distance/time
here distance is given in meters and time in seconds. so no need to convert in hours or kilometers.. just solve by the formula:
hence speed is = 90/45
= 2m/s
