18 mile per hour
Step-by-step explanation:
average speed = total distance covered by total time taken
so, avg. speed = ( 2+ 7 ) / ( 20 + 10 )
= 9 / 30
= 3 / 10
= 0.3 miles per minute
= 18 mile per hour
Answer:
22 comic books.
(20 - 9) * 2 First subtract 9 from 20
11 * 2 Multiply 11 by 2
22 is the product
1.52614E81
