In a family of four members A, B, C, and D, A is a doctor, B is a teacher, C is a lawyer, and D is a nurse. If A is married to B and they have two children, who is the lawyer?
In a practical problem, if a car travels 60 km/h and a truck travels 40 km/h, how long will it take for both to meet if they start 200 km apart and travel towards each other?
A and B can do a piece of work in 12 days and 15 days respectively. How long will they take to complete the work if A works alone for 4 days and then B joins him?