a truck covers 30km at a uniform speed of 30km/h. What what should be its speed for the next 90km if average speed for the entire journey is 60km/h??
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t = d/s
= 30/30
= 1 h
avg speed = total distance/total time
60 = 90+30/1+t'
t'= 1 h
s'= d'/t'
= 90/1
= 90km/h
= 30/30
= 1 h
avg speed = total distance/total time
60 = 90+30/1+t'
t'= 1 h
s'= d'/t'
= 90/1
= 90km/h
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