S: 900 700D: 2 m/sT: 960s
Need to find speed in seconds so convert 16 mins to seconds.
To find average, we must find time for the first part. Using the basic D/S, the time is 900/2 = 450 s.Speed for the second part is 700/960 = 35/48.
The average is worked out as following: [ 2(450) + 35/48 (960) ] / ( 450 + 960) = 1.13 m/s to 3 sig figs.