in a 1200 km journey a man driving speed was 60 km/h for the last 1/4 of the journey if he complete journey in 17 hr find driving speed for first 3/4 of journey
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1/4 of journey =300km
time taken in 1/4 journey =5hour
distance remain =900km
time left=12h
speed of remain journey =
speed = distance /time
900/12=75km/h
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