Easy Maths Question? 10 points

This is PART A to the question (I get this bit by the way)

Isha and Tim have to stuff 2700 envelopes to the ration 5 (Isha) : 4 (Tim)
How many enveloped does Tim stuff?

My answer was 1200 which is correct :)

This is PART B which I do not get :
The ratio of time Isha spends stuffing envelopes to Tim is 4:3
Who stuffed the most envelopes per hour and why?
Please explain ALL your steps and make it understandable please :) Thanks guys xoxox

If Isha spent 4 hours stuffing her 1500 envelopes, compared to Tim's stuffing his 1200 envelopes in 3 hours, she stuffed 375 envelopes per hour, while he stuffed 400 envelopes per hour, so Tim was quicker.

Isha:
= (5/9[2,700])/(4/7)
= 1,500(7/4)
= 2,625

Tim:
= (4/9[2,700])/(3/7)
= 1,200(7/3)
= 2,800

Answer: Tim stuffed the most envelopes per hour as indicated above.

im quite good with questions like this but this sounds like a badly worded question as it doesnt give a time they did it in or a time saying how long they were given to do it etc just tell your teacher that :)

Isha's rate (in some ideal units) is 5/4 and Tim's rate (in the same units) is 4/3. So Tim goes faster.