Question

a person travels from New York to Washington @ 45 kilometres per hour and comes back to the New York @ 55 km per hour . what is his average speed for the whole journey ?​

Answer 1

Answer:49.5 Km/h

Explanation:

Time = distance/ speed

Let distance be x

For going-

x/45

For coming back-

x/55

Average speed = total distance / total time

x+x / x/45 + x/55

2x / 11x + 9x / 495

2x / 20x/495

2x * 495 / 20x

49.5 Km / h is the answer

Answer 2

Answer:

50km/hr

Explanation: