B2. The excursion starts at an altitude of 548 meters and ascends by cable car to a height of 1407 meters, then by chairlift to a height of 1666 meters. From there, the journey continues on foot. The descent is by 310 meters to reach the first peak, after which an ascent of 402 meters follows. Before reaching the hut, a descent of 145 meters is necessary, followed by a climb of 297 meters and a final descent of 102 meters.

(A) At what altitude is the hut?

(B) How many meters will he have to climb the next day to reach a peak 2350 meters high?

(C) How many meters will he have to descend to return to the starting point in the valley?
B2. (A) Starting from the bench, the altitude of the hut is 1666-310+402-145+297= $1808 \mathrm{~m}$.

(B) He will have to climb $2350-1808=542 \mathrm{~m}$.

(C) At the end, he will have to descend $2350-548=1802 \mathrm{~m}$.