Can rideshare and food delivery be on the same Schedule C?

I say 2 Sch C...they are not even remotely related businesses

If it's the same vehicle used for both I would put them on one Schedule C.  Give the business a Russian sounding name like Pikup Andropov.

Defiantly one schedule C.  Whether it is Food Delivery or ride sharing it is the same business. As a former Uber Driver there were times I would get a call for Uber Eats. 

They have different activity codes 49200 for delivery drivers, and 485300 for ridesharing. I would use two schedules C

If done correctly, the tax will be the same either way. Doesn’t really matter.

I'd complete one Schedule C using the business activity code for whichever had the highest gross income.

Same as I wouldn't use two Sched F  if farmer sold crops and cattle

I would put them on 3 schedule Cs .................................. only because that answer hasn't been given yet. 😜   But in real life I would stick with one schedule C.  Why over complicate things because the next thing you are going to ask how do I break out the expenses between the two schedule Cs.  Keep it simple.  The IRS is going to get the same amount of money from the client either way so why complicate your life.

One Schedule C.  They are closely related work.  Uber and Uber Eats -- it's just the smell of what you're delivering, that's different.  

I would put on one Schedule C. They are both delivery. 

I would file one schedule C coded for delivery.  Food, groceries or people, it's still delivery.   The differences in the nature of the activities is not material and doesn't warrant the additional effort of separating them.  

Unless your client is tracking their trips by the character of their "freight", assigning vehicle expense proportional to gross receipts is more arbitrary than deciding to combine the two types of deliveries.  

The business activity codes are used by IRS as part of their audit project process.  I don't think they are going to conduct a project for one code and not include the other given the similarities of the issues.