exam Maths Puzzle Numerical Ability

Bob the bricklayer can complete a stone wall in 8 hours. Butch the bricklayer can finish the wall in 5 hours. If the two work together on the wall, how long will it take them to complete it?

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exam Other Question
Q1. In how many ways 5 girls & 5 boys can be arranged if at least 3 girls sit together?

Q2. In how many ways 7 girls & 5 boys can be arranged if at least 2 girls sit together? solve the following of linear inequality by graphing
3x-y<2
x+y>2
please dear tutors help a struggling young lady who is at her wits end with this problem.