Question

a motarboat cover 30 km in 1 hours 30 mints.how much times does it take to cover 50 km?

Answer 1

30 km= 1hr 30 min = 90 min
1km= 90/30
50 km= 90/30 x 50=150 min= 2hr 30 min

Answer 2

in 30KM motarboat takes = 90 min
in 1KM motarboat takes =90/30 min
in 50KM motarboat takes = 90/30 * 50 min
                                         = 150 min
                                         = 2 hours 30min.