It is proposed to load trucks with sand and gravel using a hoe equipped with a special 2 cy light weight bucket. This weight savings translates into cycle times which

are 6% faster. Working efficiency is 58.54 min-hr. Consider one truck size, 10 lcy.Operating the truck costs $40 /hr. Operating the hoe costs $70/hr. The round trip time of the truck, exclusive of load time, is 15 minutes. How many trucks shall be used?