A boat travels upstream at 60 km/h and downstream at 80 km/h. Calculate the boat's speed in still water and the velocity of the current.

Explanation

The speed of the boat in still water is the average of upstream and downstream speeds: (60 + 80) / 2 = 70 km/h. The speed of the stream is half the difference between downstream and upstream speeds: (80 - 60) / 2 = 10 km/h.