Physics problem, please help me!!! (urgent)?

Question

A train is increasing its speed constantly from 10m/s to 20m/s in 60s.

(a) what is the average speed in that period of 60s in m/s?

(b) what is the distance passed by the train when the speed increases?

Answer 1

a)15m/s.

b)900m.

Answer 2

(a) 2 methods to solve:

Method 1:

distance travelled = area under the v-t graph

= 0.5 (10+20) 60 = 900m

Average speed = 900 / 60 = 15m/s (ans)

Method 2:

Average speed = (initial speed + final speed) / 2

= (10 + 20) / 2 = 15m/s (ans)

(b) distance = 900 m (from above)

Answer 3

It is really early and I am tired.  But I am pretty sure that 10 m/s difference in the two velocities are incremented by 1.667m/s.  when this is done over 60 seconds it end up averaging 15.083 m/s.  That speed multiplied by 60s equals 905 meters.  

But that is just off the top of my head.