Arjun rides his bike 10 km at an average speed of 30 km/hr, and again travels 14 km at an average speed of 25 km/hr. What is his average speed (approx.) for the entire trip?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 26.87 km/hr.
We know that,
Average Speed = Total Distance/Total Time and
Time = Distance/Speed
Time taken by Arjun to cover 10 km = 10/30 = 0.33 hours
Time taken by Arjun to cover 14 km = 14/25 = 0.56 hours
So,
Average Speed = (10 + 14)/(0.33 + 0.56)
⇒ 24/0.89 = 26.87 km/hr