Question 1: A boat can travel 60 km upstream in 6 hours. If the speed of the stream is 4 km/h, what is the speed of the boat in still water?

Answer: a) 8 km/h

Question 2: If the speed of a boat in still water is 15 km/h and it can travel 40 km downstream in 2 hours, what is the speed of the stream?

Answer: d) 10 km/h

Question 3: A boat takes 3 hours to cover a certain distance downstream, but it takes 6 hours to cover the same distance upstream. What is the speed of the stream if the speed of the boat in still water is 12 km/h?

Answer: b) 3 km/h

Question 4: Two boats, traveling at 15 km/h and 20 km/h, respectively, can cover a certain distance in 6 hours when traveling downstream. If they travel upstream, they cover the same distance in 10 hours. What is the speed of the stream?

Answer: c) 5 km/h

Question 5: A boat travels 30 km downstream in 2.5 hours. If the speed of the boat in still water is 12 km/h, what is the speed of the stream?

Answer: a) 4 km/h