exam Maths Puzzle Numerical Ability

PLEASE HELP- A TRAIN LEAVES THE STATION AT 6PM GOING WEST AT 80 MI/. ON A PARRALLEL TRACK ANOTHER TRAIN LEAVES 3HRS LATER GOING 100 MI/H. AT WHAT TIME WILL THE 2ND TRAIN CATCH UP WITH THE FIRST TRAIN?

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can yo help me solve this: An airplane was at a crusing altitude, then descended 3,500ft. If the airplane is at 28,500 now, what was the crusing altitude? (a) A couple drive to France to buy wine. They pay �100 return fare to use the tunnel, �80 for two nights accommodation, and use 30 litres of diesel on the journey (15 litres going