can someone me differentiate?

Let and . By the product rule,

By the power rule, we have and , but are functions of , so we also need to apply the chain rule:

and we have

So we end up with

Replace to get everything in terms of :

We can simplify this by factoring:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

never fear papaguy is here

answer