Question 1053777
{{{ 25*(4/60) + 50*(8/60) + 20*(2/60) }}}
{{{ 100/60 + 400/60 + 40/60 }}}
{{{ ( 1/60 )*( 100 + 400 +  40 ) }}}
{{{ 540/60 = 9 }}}
The total distance covered is 9 km
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Find the total time
{{{ 4/60 + 8/60 + 2/60 = 14/60 }}}
The average speed is:
{{{ 9 / ( 14/60 ) = 9*( 60/14 ) }}}
{{{ 540/14 = 38.57 }}}
38.57 km/hr