a) 16 hours
b) 18 hours
c) 20 hours
d) 24 hours
Answer: d
Explanation: Speed upstream = 7.5 kmph
Speed downstream = 10.5 kmph
Total time taken
= $$\left( {\frac{{105}}{{7.5}} + \frac{{105}}{{10.5}}} \right)$$ hours
= 24 hours
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