To find the average speed, we first need to convert the given values to the same units.

Since 1 minute is equal to 60 seconds, we convert t2 to seconds:

t2 = 1 minute * 60 seconds/minute = 60 seconds

Now we have t2 = 60 seconds and S2 = 30 meters.

Average speed is given by the formula:
Average speed = Total Distance / Total Time

Total Distance = S2 - S1 = 30m - 10m = 20m
Total Time = t2 = 60 seconds

Average speed = 20m / 60s = 0.333 m/s

Therefore, the average speed is 0.333 m/s.