While going to office, Sneha travels at a speed of 10 km/h and on her way back, she travels at a speed of 15 km/h. What is her average speed for the whole journey?
Answer & explanation
Correct answer: option 2
We know ,
Average speed = \(\frac{2 × S1 ×S2 }{S1 + S2}\)
According to question ,
Average speed = \(\frac{2 × 10 × 15 }{10 + 15}\)
= 12 km/h