Question

Jain drives from city A to B at average speed of 90 kilometre per hour as soon as I reach heater around and come back to city but this time at an average speed of 30 kilometre per hour what is the average speed in the kilometre per have for the whole journey?

Answer 1

Answer:

Sorry , but I didn't  understand your question properly . Is this question complete is ?

Step-by-step explanation:

Answer 2

let sat distance = 90D km

speed from A to B = 90 km/hr

Time from A to b =90D/90 = D hr

speed from B to A = 30 km/Hr

time from B to A = 90D/30 = 3D hr

total distance = 90D + 90D = 180D km

total time taken = D + 3D = 4D hr

average speed = 180D/4D = 45 km/Hr