Answer:
t = 480 seconds
Step-by-step explanation:
Let
Time taken for a water heater to boil water = t
power of the water heater = p
Constant of proportionality = k
t = k/p
240 = k/2000
Cross product
240 * 2000 = k
k = 480,000
Find the time it takes to boil water when the power is reduced to 1000 Watts.
t = k/p
= 480,000/1000
= 480
t = 480 seconds
t = 480 seconds when p = 1000 watts
