First find the total distance to the beach: 16 blocks * 1/8 mile/block = <<16*1/8=2>>2 miles
Then find how long in hours Jack has to get to the beach: 10 minutes / 60 minutes/hour = 1/6 hour
Then divide the distance Jack needs to cover by the time in hours he has to find how fast he needs to jog: 2 miles / 1/6 hour = 12 miles/hour
#### 12