Priya covers a certain distance by her car at a speed of 21 km/h and returns at a speed of 17 km/h. What is her average speed during the travel?
Answer & explanation
Correct answer: option 1
Average Speed = \(\frac{2 × S1 × S2 }{S1 + S2}\)
= \(\frac{2 × 21 × 17 }{21+17}\)
= \(\frac{357 }{19}\)
= 18\(\frac{15 }{19}\)
So , the average speed during whole journey is 18\(\frac{15 }{19}\)