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A man walks towards east a distance of 3km at a rate of 5 km per hour and then towards north a distance of 4 km at a rate of 3 km an hourfind the average speed and velocity?
Speed is a scalar, velocity is a vector and so the direction of motion is important for velocity. Total distance travelled = 3km + 4 km = 7 km Total time taken = 3/5 hours + 4/3 hours = (9+20)/15 = 29/15 hours Average speed = 7 / (29/15) = 7*15/29 = 3.6207 km per hour. Final location = 3 km E + 4 km N = 5 km away from the starting point (by Pythagoras) in the direction 53.13 degrees = arctan(4/3). So average velocity = 5 / (29/15) = 5*15/29 = 2.5862 km per hour in the direction given above.
What is the speed in kilometers per hour of a boat that travels 87 km in 3 hours?
29 km per hour.
Is 29 m greater than 0.0029 km?
The first thing to do when answering this question is to make sure that the units are consistent. There are 1000m in a km, so to convert km to m you need to multiply by 1000. In this case, 0.0029km x 1000 = 2.9m. So the question is asking "is 29m greater than 2.9m?" It is clear that the answer is yes.
How long does it take to travel 314 miles at 70 mph?
314 miles = 505,334 km 70 mp/h = 112,654 km/h 505334 m/ (112,654 /3.6) = 16148,90 seconds = 269,14 minutes = 4 hours, 29 minutes and 8,4 seconds
What is 22.56 km 8420 m?
2.56 km + 8420 m = 22.56 km + 8.42 km = 30.98 km
