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The boat's speed in still water is 20% greater than the speed of the stream. If it takes the boat 4 hours more to travel 176 km downstream than it does to travel 8 km upstream, what is the time required for the boat to travel 264 km downstream and 16 km upstream?

A 20 hrs

B 18 hrs

C 22 hrs

D 10 hrs

E None of these

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