Question
Download Solution PDFA bus travels at a speed of 40 km/hr to a destination & returns back at a speed of 60 km/hr. The average speed during the complete journey is km/hr.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Speed when bus goes A to B = 40 km/h
Speed when bus returns B from A = 60 km/h
So, Average speed = (2 × 40 × 60)/(40 + 60)
⇒ Average speed = (2 × 40 × 60)/100
⇒ Average speed = 48 km/h
∴ The average speed of the bus is 48 km/h.
Hence, "Option 2" is the correct answer.
Additional InformationFormula used:
Average speed = 2ab/(a + b)
a = Speed a object when it goes from A to B.
b = Speed of a object when it returns same place
Formula is only used when the distance travels by all the speed is equal.
Important Points 1) When the two speed are given,
Average speed = 2xy/(x + y)
2) When three speeds are given,
Average speed = 3xyz/(xy + yz + zx)
Note: All the above formula is only used when the distance travels by all the speed is equal.
Last updated on Mar 21, 2025
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