exam Maths Puzzle Numerical Ability

Can you show me differenet ways of converting metric units into other metric units or web site thank you

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4^0 - 64/2^4 - (-3)^0 - 3^0 - 2[(-3-2^0) - (-3 -2)] a train leaves the station at 6:00pm traveling west at 80 mi/h. on a parallel track, a second train leaves the station 3 hours later traveling west at 100mi/h. at what time will the second train catch up with the first?