A boat, which moves at 13 miles per hour in water without a current, goes 80 miles upstream and 80 miles back again in 13 hours. Find the speed of the current to the nearest tenth.

Speed of current is 3 miles per hour.

Step-by-step explanation:

Speed of boat without current, u = 13 miles/hr

Let speed of current = v miles/hr

Speed upstream = (13 - v) miles/hr

Speed downstream = (13 + v) miles/hr

Distance traveled upstream, = 80 miles

Distance traveled downstream, = 80 miles

Total time taken, T () = 13 hours

Formula for Total Time taken:

Time taken in Upstream:

Time taken in Downstream:

So, speed of current is 3 miles/hr

2 x^2 -3x+p

sum of roots = 3/2

let other root be x

3+ x = 3/2

x= 3/2 - 3 = -3/2

product of roots = p/2

3× -3/2 = p/2

-9 = p

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the answer is (-4,-4)

hope this ! : d