1. The first half of a road cyclist passes a speed V1 = 20 km / h. Three quarters of the remaining

1. The first half of a road cyclist passes a speed V1 = 20 km / h. Three quarters of the remaining time he spends with speed V2 = 15 km / h, and the rest with speed V3 = 10 km / h. What is the average speed with which the cyclist has spent all time? 2. athlete training ran to the top of the hill at a speed 12 km / h, and down the same path at a speed 16 km / h. What is the average speed with which the athlete January ran the entire course? 3rd Passenger and train fast run on parallel tracks in the same direction. Passenger train 200 m long are traveling at 54 km / h, and rapid length 150 m, moving chronoexpres with speed 20 m / s. How long fast train will overtake passenger? 4. The distance between the two bodies are moving steadily in the same direction opposite directions is reduced to 16 m for a period of 10 s, and if you are moving in the same direction with the same speed as in the previous case, the distance shall be increased by 6 m. With how much speed moving bodies? 5th Passenger train 100 m long and long freight train 200 m, which is 2 km distance from one another, chronoexpres move uniformly in a straight parallel lines. chronoexpres When moving in the same direction, the passenger train overtaking load for 460 s and when moving in the opposite direction with the same speed diverge for 92 j. With how much medium speed trains run? 6. A passenger traveled from his village to the railway station. After an hour he spent walking 3 km and concluded that the train is late for 40 minutes if you continue to move at the same speed. Because the rest of the road past a speed 4 km / h and so Stas 45 minutes before the departure of the train. The village away from the railway station?
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