A train has a speed of $60\, km/h$. for the first one hour and $40\, km/h $ for the next half hour. Its average speed in $km/h$ is
A train has a speed of $60\, km/h$. for the first one hour and $40\, km/h $ for the next half hour. Its average speed in $km/h$ is
$50$
$53.33$
$48$
$70$
A train has a speed of $60\, km/h$. for the first one hour and $40\, km/h $ for the next half hour. Its average speed in $km/h$ is
Distance travelled by train in first $1$ hour is $60 \,km$ and distance in next $1/2 \,hour $ is $20 \,km$.
So Average speed $ = \frac{{{\rm{Total\, distance }}}}{{{\rm{Total \,time }}}} = \frac{{60 + 20}}{{3/2}}$
$ = 53.33\;km/hour$
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