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I'm trying to answer a question in minutes but I just can't seem to be able to eliminate all the other units.

((B×D)/(M×PWR))×60

B = 500Wh, D = 80% of B, M = 12.505kg, PWR = 55W/kg

I should be able to cancel out Watts as one is a numerator and the other a denominator. D is unitless? which leaves me with lets say

(400h/12.505kgx55kg)x60

I can't just cancel out kg as they are both denominators... right? so that's where I'm stuck. if I can't cancel kg and just leave me with **hx60 and end up with an answer I can put into minutes.

Any help is appreciated!

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Your original equation is: $$\displaystyle \frac{Wh}{kg \times\frac{W}{kg}}$$

Cancelling W gives: $$\displaystyle \frac{h}{kg \times\frac{1}{kg}}$$

$$\boxed{\text{Remember that cancelling W from the denominator leaves} \frac{1}{kg} \text{and not kg}}$$

Simplifying the denominator: $$\displaystyle \frac{h}{{kg} \times\frac{1}{kg}} \rightarrow \frac{h}{1} $$

$$\therefore h$$

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  • $\begingroup$ Thank you Shane, your answer has cleared up my confusion $\endgroup$
    – Paul
    Commented Aug 31, 2021 at 12:18

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