The air temperature at the foot of the mountain is unknown. The height of the mountain is 5000m.

The air temperature at the foot of the mountain is unknown. The height of the mountain is 5000m. At the top of the mountain, the temperature is -5 degrees. What will it be at the foot?

When the altitude changes by 1000 meters (1 km), the air temperature changes by 6оС. Moreover, with an increase in altitude, the air temperature decreases, and with a decrease, it rises.

The solution of the problem:

1) Let’s find how many degrees the air temperature at the foot differs from the temperature at the top of the mountain:

(5000: 1000) × 6 = 5 × 6 = 30 (degrees).

Since the foot is at the bottom, the temperature will rise.

2) Find the temperature at the foot:

-5 + 20 = 25 (degrees).

Answer: the temperature at the foot of the mountain is 25 ° C.