The motor boat sailed along the lake at a constant speed and covered 40 km in 3 hours. What is the speed of the motorboat.

In order to determine the speed of a motor boat, you need to use the following formula:
V = S / t,
Where:
V is the speed of the motor boat;
S is the distance covered by the motor boat;
t is the time during which the motor boat covered the specified distance.
V = 40/3 = 13 1/3 km / h.
Answer: The speed of the motor boat is 13 1/3 km / h.