1. The length of the train that crossed a pole in 9 seconds while traveling at 60 km/hr is 180 meters.
2. A, B, and C can complete the work in 10 days if they work together every third day.
3. To gain a 20% profit, the vendor must sell the toffees at 7.5 for a rupee.
4. The youngest child is 3 years old.