The task is to generate the correct answer for a given math problem.
--------
Question: Problem: a train 200 m long can cross an electric pole in 5 sec and then find the speed of the train ?

Answer: 144

Question: Problem: a man , a woman and a boy can together complete a piece of work in 3 days . if a woman alone can do it in 6 days and a boy alone in 18 days , how long will a man take to complete the work ?

Answer: 9 days

Question: Problem: the speed of a boat in still water is 60 kmph and the speed of the current is 17 kmph . find the speed downstream and upstream ?

Answer:
77,43 kmph