A kangaroo hops 2 kilometers in 3 minutes. At this rate, how many minutes does it take the kilometer to hop 21 kilometers?

31.5

Step-by-step explanation:

2k(3) meaning for every 1k it takes 1:30 seconds, but working in seconds is different than working in regular decimals since it is out of 100.

SO 21k/2 = 10.5

10.5(3) = 31.5

your answer is  

a.

5

step-by-step explanation:

the answer is option a you would get more money.it would be $250.

step-by-step explanation:

for option b 200/2=100=50% 100/2=50=25% 50/5=10=5% it would be $220