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Problems: Velocity and speed

1. A car travels from A to C as shown on the map below. The distance from A –C is 50km and the car starts off at an average speed of 50kmhr-1 hoping to make the journey in 1 hour. After 20km the car has to stop at some road works at B for 10 minutes, calculate the average speed be for the rest of the journey (from B to C) so that the car arrives on time?

2. Two identical boats that can travel 5ms-1 in still water have a race in a river that is flowing at 2ms-1. Boat 1 travels 100m from A to B and back and boat 2 travels100m from A to C and back. Who wins and by how many seconds?

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