A motorist travels from a town P on a bearing of 150°to a town Q 40km away. From Q he travels to a town R on a bearing of 210°if R you s located directly south of P, how far is R from P?(a)40√3km(b)40√2km(c)40km(d)80km​

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?