exam Maths Puzzle Numerical Ability

1. At noon a private plane left austin for los angeles,2100km away, flying at 500km/hr. one for austin at 700km/hr. at what time did they pass each other?

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Can someone help me on this problem?

I need to add: 3/11 + 9/11 + 1/11 in the simplest form.

Thanks,
Sher
My question asks me to show how to convert 8 quarts to gallons using a unit multiplier. (1 gal = 4 qt)
I know the answer but I am having trouble writing the conversion.