Expert answer:I need help with math problems

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Answer & Explanation:1.   A boat can travel with a speed of 13 km/hr in still water. If the speed
of the stream is 4 km/hr, find the time taken by the boat to go 68 km
downstream2.
A man’s speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man’s speed against the current is3.   A boat running upstream takes 8 hours 48 minutes to cover a certain
distance, while it takes 4 hours to cover the same distance running
downstream. What is the ratio between the speed of the boat and speed of
the water current respectively? 4. A boat running upstream takes 8 hours 48 minutes to cover a certain
distance, while it takes 4 hours to cover the same distance running
downstream. What is the ratio between the speed of the boat and speed of
the water current respectively

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