exam Maths Puzzle Numerical Ability

3.5 * 10 -7 moles per liter

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exam Other Question

Write a full solution for the following question.

Vince left Trout Creek driving at 40km/h. Mike followed 2 hours later driving at 50km/h. How far down the road will Mike overtake Vince? I need help with this problem

x+y=7
x-y=9

Please help