Question

A girl cycles from her house to school at a speed of 18 km/ h and reaches there in 20 minutesfind the distance of the school from house

Answer 1

distance=speed/time

= 18/20

=9/10 or 1.1km

Answer 2

first we have convert 18 km/h in m/s

so,

18 km/h= 18×1000/60×60 m/s

= 18000/3600 m/s

=5 m/s

then,

we find distance

so,

distance= speed × time

= 5m/s × 20 m

=5m/s × (20×60)s

=5m/s ×1200s

=6000metre

=6 km