2. Method 1: 1 truck 1 secondary coal transport 120/6/5=4t, then 8 trucks transport coal for 6 times 8*4*6= 192t.
Method 2: add three or two trucks, which is 3/5 of the original. If the delivered quantity remains unchanged, the coal transportation will increase 120*3/5=72.
Total * * * coal transportation 120+72= 192.
3. If Party A produces 2 less than Party B per hour, it will produce 6 * 2 less than Party B within 6 hours =12.
Party A produces 8 hours, Party B produces 6 hours, and Party A produces 88 more than Party B, so Party A must produce 88+ 12= 100 in two hours, and 100/2=50 B = 52 per hour.
Hope to adopt