A car travels from Bangalore to Mysore, a distance of 144 km, at 72 km/hour. On the return journey,
it travels at 36 km/hour. What is the average speed for the total journey?
A. 54 km/hr
✓
B. 36 2 km/hr
C. 48 km/hr
D. None of the above
Answers
Answer:
48km/hr
Step-by-step explanation:
distance traveled = 144 km, speed 1 = 72 km/h, speed 2 = 36 km/h, Avg speed = ???
Formula: Avg speed = total distance traveled / total elapsed time
Solving for the elapsed time for the outgoing journey
elapsed time = distance traveled / speed 1
elapsed time = 144 km / 72 km/h
elapsed time = 2 hours
Solving for the elapsed time for the return journey
elapsed time = distance traveled / speed 2
elapsed time = 144 km / 36 km/h
elapsed time = 4 hours
solving for the total elapsed time
total elapsed time = 2 hours + 4 hours
total elapsed time = 6 hours
Solving for the average speed for the whole journey
Avg speed = total distance traveled / total elapsed time
Avg speed = (2 * 144 km) / 6 hours
Avg speed = 288 km / 6 hours
Avg speed = 48 km / h
Please mark my answer as BRAINLIEST