Question

a train travel 81.6 km per hour? how much distance will it cover in 1.5 hours?

Answer 1

Per hour 81.6 km
per half hour 40.8km
so in 1.5 hours 81.6+40.8=122.4 km

Answer 2

81.6 km in 1 hour
1.5 hour =81.6*1.5
=122.4