Answer:
Question 3
In 15 minutes, the tortoise walked 400 meters
1 hour ---> 60 minutes
60 minutes is 4 x 15 minutes
4 x 15 // 400 x 4
1 hour // 1600 meters = 1.6 kilometers
the tortoise can walk 1.6 Kilometers per hour
Question 4
2 quart bottle for 2.56$
1 quart = 32 fluid ounces
2 quart = 64 fluid ounces
2.56/64 = 0.04$ per fluid ounce