Question 757506
Average speed is always ( total distance traveled ) / ( total time )
{{{ 5*6 = 30 }}} km
{{{ 4*12 - 48 }}} km
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{{{ 6+ 4 = 10 }}} hrs
Ave speed = {{{ ( 30 + 48 ) / 10 }}}
Ave speed = {{{ 78/10 }}}
Ave speed is 7.8 km/hr