It took a messenger 30 minutes to deliver a message from point A to point B. On the way back he reduced his speed by 1mph and it took him 36 minutes to get back. Find the speed with which the messenger was going from point A to point B.
1) The minute hand of a clock is 7 cm long. Calculate the distance covered and the displacement of minute hand of the clock from 9.00 AM to 9.30 AM.
2) An athlete completes a round of a circular track of diameter 200 m in 20s. Calculate the distance travelled by the athlete.
3)A boy is running on a straight road. He runs 500 m towards north in 2 minutes 10 seconds and then turns back and runs 200 m in 1 minute. Calculate his average speed and magnitude of average velocity during the whole journey.
4) Akshil drove his car with speed of 20 km/h while going to his college. When he returned to his home along the same route , the speed of the car is 30 km/h. Calculate the average speed of the car during the entire journey.
Raj is running on a 4 km long oval-shaped track. He takes a break of 5 minutes in between. If he completes one lap in 25 minutes, what is his average speed and average velocity ?