Question

motor boat goes downstream 30 km and again returns to the starting point in a total time of 4 hours and 30 minutes if the speed of the stream is 5 kilometre per hour then find the speed of motor boat in still water​

Answer 1

Step-by-step explanation:

Let the speed of the stream be x km/hr. Then,

Speed downstream = (15 + x) km/hr,

Speed upstream = (15 - x) km/hr.

30 + 30 = 4 1

(15 + x) (15 - x) 2

900 = 9

225 - x2 2

9x2 = 225

x2 = 25

x = 5 km/hr

Answer 2

PLZ MARK AS BRAINLIST

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