a girl moves with speed of 40km/h for the next three hours.Findthe average speed of the girl and the total distance moved
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we don't know speed for first hour
for first hour speed is x km per hour it goes x km
then for next three hour speed is 40 km/ h it covers distance 120 km
avg speed is x+120/4
for first hour speed is x km per hour it goes x km
then for next three hour speed is 40 km/ h it covers distance 120 km
avg speed is x+120/4
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