A Horse in London

A man hired a horse in London at 3 pence a mile.  He rode 94 miles due west to Bristol, then due north to Chester, whence he returned toward London for 66 miles, which put him in Coventry.  From Coventry he made a round trip to Bristol and then continued on to London.  How much did he owe for the hire of the horse if the road from Coventry to Bristol meets the road from Chester to London at right angles?

The Ladies' Diary, London, 1712

Click here to reveal the answer