Question

A train has a speed of 60 km/h, for
the first one hour and 40 km/h fo
the next half hour. Its average
<
speed in km/h is​

Answer 1

Speed for 1st hr=60km/hr.

Speed for half hr=40km/hr.

Distance in 1st hr.=60km

Distance in next half hour=20km

Total distance=80km

total time=90mins.

avg.Speed=total distance/total time

80km/90/60hr

=160/3km/hr

=53.33km/hr.