Rakesh traveled for 2.5 hours at 40 kmph and for another 2.5 hours at 60 kmph. Find his average speed for the journey (in kmph).
Answer & explanation
Correct answer: option 2
Speed = \(\frac{ Distance}{ Time}\)
Distance= Speed x Time
Distance travelled with 40 km/hr speed = 40 x 2.5 = 100km
Distance travelled with 60 km/hr speed = 60 x 2.5 = 150km
Average speed = \(\frac{ \text{Total distance travelled}}{\text{Total time taken}}\)
Average speed = \(\frac{\text{100 + 150}}{\text{2.5 + 2.5}}\)
Average speed = \(\frac{\text{250}}{\text{5}}\)
Average speed = 50 km/hr