Which was accomplished of Oleg?

Oleg defeated the Khazars, delivering several Slavic tribes from dependence upon them, and also undertook a successful expedition against Constantinople (907), forcing the Byzantine government to sue for peace and pay a large indemnity.

cuban communists pressured the soviet union to place missiles in cuba.

ok, so basically your gonna start with 350 ok. so there's 60 seconds in a minute so that means you he can go up 10 ft per minute. soo, after 3 minutes he should be at 260 ft after three minutes : )