lizavetadremina

09.01.2022 18:41 •  Математика

НО РАСПИШИТЕ КАК ВЫ ДО ЭТОГО ДОДУМАЛИСЬ
80 of us are kick ass skiers excited to ski down the black slope first. Given the overall excitement, the line for the black slope is 30min.
The slope is 5 km long and the average speed per rider is 2 km per minute. One of our tech guys claims to go down this slope 40% faster than the average rider. If that claim is true, how long does it take him to go down the slope?
A) 2min 12sec
B) 1min 54sec
C) 1min 47sec
D) 1min 30sec
E) 1min 18sec