Arunner travels 20 miles in 5 sec and then travels another 80 m in 15 sec what is his average speed? explain

i think its c if i'm wrong

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.