In the box below, enter the value that missing from the table.

For this case we have the following equation:
 d = v * t
 Where,
 d: distance
 v: speed
 t: time
 Clearing the time we have:
 t = d / v
 Rewriting:
 t = d * (1 / v)
 We look for the value of d:
 For t = 1, v = 75 we have:
 1 = d * (1/75)
 d = 75
 Then, v = 15 we have:
 t = 75 * (1/15)
 t = 5 hours
 
 The value that is missing from the table is:
 t = 5 hours