exam Maths Puzzle Numerical Ability

From Abu Dhabi to Al-Ain is 149 km. A cyclist starts from Abu Dhabi cycling to Al-Ain at a steady speed of 14 km/hr. An hour later, a car starts from Al-Ain going to Abu Dhabi at a steady speed of 4o km/hr. How far from Abu Dhabi do they meet?

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exam Other Question

Kevin works 3 times as many hours in a week as Karen does. If each were to work 6h more per week, Kevin would be working twice as many hours as Karen does. How many hours does each work now? -(3-10)-(6-3)
My answer is not coming out correctly.
Please see my version-

-(3+(-10))-3=
-(-7)-3=
-(-7)+(-3)= -13

The textbook gives the answer as 4. Where am I going wrong?

Thank you.