A chariot came up - for six hundred shekels - This was the ordinary price of a chariot, as a hundred and fifty shekels were for a horse.
Kings of the Hittites - These must have been the remains of the original inhabitants of Canaan, who had gone to some other country, probably Syria, and formed themselves into a principality there. It seems that neither horses nor chariots came out of Egypt but by means of Solomon's servants.
Taking the shekel at about three shillings of our money, six hundred silver shekels would be equal to about 90; and 150 shekels to 22British pounds and 10 shillings. “Average” price seems to be in each case intended; and we may account for the comparatively high price of the chariot by supposing that by “chariot” is intended the entire equipage, including car, harness, and trained horses, of which there would be two at least, if not three. The “horses” mentioned separately from the chariots are not chariot-horses, but chargers for the cavalry.
The kings of the Hittites - See 2 Kings 7:6 note. The kings intended were probably Solomon‘s vassals, whose armies were at his disposal if he required their aid.