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thanks so much but I actually figured it out already. I just had a bit of a panic attack when I posted this, but I still really appreciate the quick response. I now see the answer would be 300 km/hr...sorry for wasting your time.

The trip there took 7 hours. The trip back took 10. What was the plane's speed on the way there if it went 210 kilometres per hour on the return trip? Please help I'm desperately confused.