1.The distance between a and b is 360 kilometers. Car A traveled 1 in the first hour from A to B, and the distance in the second hour was 6/5 of that in the first hour. How many kilometers did you walk in the second hour?

360 * ( 1/6) * (6/5) = 72km。

2. A book has 300 pages. Xiaohua read four fifths of 15 on the first day and 1 on the second day. How much is left?

300 * (1-4/15-1/3) =120 pages

3. A barrel of oil is packed in 9 bottles respectively. If each bottle is 5 kg 6 and there is 1 kg oil left in the barrel, how many kilograms of oil is there in this barrel?

9 * 5/6+1/2 = 8kg

The students planted 120 trees, of which two fifths were in grade six and five sixths were in grade five. How many trees were planted in the fifth grade?

120*(2/5)*(5/6) = 40 pieces.

5. Zhang Leo has 72 stamps, and Wenli's stamps are 7/9 of those of Zhang Li and 7/8 of those of Wang Na. How many stamps are there in Wang Na?

72*(7/9)*(7/8)= 49 pieces

I wish you progress in your studies and go up a storey still higher! (*^__^*)