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so in the first situation the boat went 30km up and 40 km down just in 10 hours , and in the second situation the boat went 40km up and 55km down in 13 hours , this means that the boat went 10 km higher in the second situation and 1 km lower in the second situation in 13 hours .
so= add up the differences =10+11=20km
distance is 20
time= 13+10= 23
speed = distance by time = 20km = 20000m/1380mins
= 14.4927
chaturyaya:
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its wrong answer
my answer is right i am sure
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