A dolphin can swim up to 60 miles per hour. What is this speed in feet per hour? F. 8 feet per hour H. 316,800 feet per hour G. 10,560 feet per hour I. 48,400 feet per hour​

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?