Question
Download Solution PDFA jeep travels to a place 300 km away at an average speed of 60 km/h and returns at a speed of 30 km/h. What is the average speed (in km/h) for the whole journey?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
A jeep travels to a place 300 km away at an average speed of 60 km/h and returns at a speed of 30 km/h.
Concept used:
When the distance is constant, the average speed = 2xy/x+y (where x and y are the two speeds at which the same distance has been covered.)
Calculation:
Here, the travelled distance is the same i.e. 300 km.
According to the concept,
The average speed for the whole journey
⇒ (2 × 60 × 30) ÷ (60 + 30)
⇒ 3600 ÷ 90
⇒ 40 km/h
∴ The average speed for the whole journey is 40 km/h.
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