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Express speed = distance /time
= 9/3 km/h
= 3km/h
Distance covered 30 minutes
= 3 x (30/60)
=1.5 km
Time taken = 3hr
Hence 3 = ½ +((9-1.5)/x) + 10/60
X= 7.5 /2.33 km/h
X = 3.2143 km/h
joseph rimiru answered the question on October 10, 2017 at 14:02
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