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**-Equilibrium-** Could somebody help me with this question?

Im not sure what to really do, as I'm finding myself with an extra unknown, and Im certain there's a easier method of solving this question.

Any help would greatly be appreciated.

Thank you.

**An aircraft used for fire spotting, flies from its base to locate a fire at an unknown distance, x km away. It travels straight to the fire and back, averaging 240km/h for the outward trip and 320km/h for the return trip. If the plane was away for 35min, find the distance, xkm. **