Problems: Velocity and speed

1. A car travels from A to B as shown on the map below. The distance from A –B 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 for 10 minutes, calculate the average speed be for the rest of the journey 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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