Two trucks Truck-1 and Truck-2 go from factory to warehouse and vice versa. The distance from factory to warehouse is 100 km and there is only one straight road connecting them. One day, Truck-1 and Truck-2 start at the same time from factory and warehouse, respectively. Each of the trucks goes to its destination and then comes back, and repeats the process continually. Speeds of Truck-1 and Truck-2 are 30 km/hr and 70 km/hr. Where will Truck-1 and Truck-2 meet for the second time?