Question 343938
Rate*Time=Distance
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{{{R*t=D}}}
{{{t=D/R}}}
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{{{t[1]=30/60=1/2}}}hr
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{{{t[2]=30/40=3/4}}}hr
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Total Time:{{{T=t[1]+t[2]=1/2+3/4=2/4+3/4=5/4}}}hrs={{{75}}}minutes
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Average Speed=Total Distance/Total Time
{{{Vave=60/(5/4)=48}}}km/h