The temperature reached after four hours of cooling is 140 F (or) 42 C.
Explanation:
A food worker cooled a cup of soup for two hours,
step 1: The temperature reached in two hours= 70 F (or) 21 C
step 2: Then for four hours, it is twice the value
∴ The temperature reached in four hours= 2(70)= 140 F (or) 2(21)= 42 C