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January 30, 2015

January 30, 2015

Posted by **Henry P** on Sunday, May 27, 2012 at 5:18pm.

- Math -
**Henry**, Monday, May 28, 2012 at 8:30pmVb - Vw = 84km/6h = 14km/h.

Vb + Vw = 84km/4.2h = 20 km/h.

Eq1: Vb - Vw = 14

Eq2: Vb + Vw = 20

Add the Eqs:

2Vb = 34

Vb = 17 km/h. = Velocity of boat.

In Eq2, substitute 17 for Vb:

17 + Vw = 20

Vw = 3 km/h = Velocity of the water.

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