Find(g o f)(x) when f(x)=square root x+3 and g(x)= x^2+2/x

Which ratio is equivalent to 10: 85

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling