Student: The speed of a boat in still water is 50kmph and the speed of the current is 20kmph. Find the speed and upstream?\nOptions:\n(A) 30 kmph\n(B) 40 kmph\n(C) 78 kmph\n(D) 15 kmph\n(E) 23 kmph.
Another student: Let's say, hmmm...

User
Speed downstream = 50 + 20 = 70 kmph\nSpeed upstream = 50 - 20 = 30 kmph Final answer: (A).
Assistant