13. (II) Two locomotives approach each other on parallel tracks. Each has a speed of 155 km/h with respect to the ground. If they are initially 8.5 km apart, how long will it be before they reach each other? (See Fig. 2–35.) 8.5 km→ v = 155 km/h v = 155 km/h FIGURE 2-35 Problem 13.

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