Question

40 km in 2 hours how much time it will take to cover 50 km

Answer 1

1 hour =40/2=20km
Time to travel Distance cover in 50km=50/20
=2.5hours

Answer 2

km                              hours
40                                 2
50                                  x

x=50*2 divided by 40
  =100/40
  =5/2
  =2.5 km