exam Maths Puzzle Numerical Ability

Combinations of 23 cents and 32 cents stamps can be used for 55 cents and 78 cents postage and many other amounts. But no combination of 23 cents and 32 cents stamps can be used to

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two trains leave a station at the same time,heading in opposite directions.one train is traveling at 80km/h,the other at 90km/h.how long will it take for the trains to be 425km apart? a grocer mixes cookies worth 80 cents a kg with cookies worth 95 cents a kg making a mixture selling at 85 cents a kg. If he mixes 60 kilograms , how many kilograms of each kind does he use?