The speed of a motor boat is 20 km/hr. For covering the distance of 15 km the boat took 1 hour more for upstream than downstream.
Which is the correct quadratic equation for the speed of the current?
a) x2 + 30x − 200 = 0
b) x2 + 20x − 400 = 0
c) x2 + 30x − 400 = 0
d) x2 − 20x − 400 = 0
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Step-by-step explanation:
c) x2 + 30x − 400 = 0
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