The answer for your question is B
Answer:
hmmm I think u need to talk to ur teacher
The rate is 1km/15min
It's a fraction where the denominator is 15 minutes.
To make it a unit rate, we need to make the denominator 1.
A unit rate would be 4 km / hour.
We can tell it’s not a permutation because it’s picking two people. Order doesn’t matter.
The number of total possible groups of men is 9 C 2 = 9!/((9-2)!(2!)) = 36
The number of total possible groups of women is 11 C 2 = 11!/((11-2)!(2!)) = 55
55 * 36 = 1980 different groups in the committee
