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Let
- · · · + n. Find the value of T1 + T2 + T3 + · · · + T20. 3.
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Let
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Two trains start simultaneously from stations A and B, which are 480 km apart, moving toward each other at 60 km/h and 100 km/h respectively. At the instant the trains start, a bird sitting on the front of the train at A takes off and flies toward the train at B at a constant speed of 200 km/h. As soon as it reaches the other train it instantly turns back, and continues shuttling between the two trains until they meet. What is the total distance (in km) flown by the bird?