While travelling from Nashik to Daman, Harsh drove for 1 hour at a speed of 50 km/h and for the next three hours at 60 km/h. What was his average speed for the whole trip?

57.5 km/h

Average Speed = \(\frac{Total \; DIstance }{Total \;Time }\)

Total distance = 1 × 50 + 3 × 60 = 50 + 180 = 230 km

Total time = 1 + 3 = 4 hour

Average speed = \(\frac{230 }{4 }\)

 = 57.5 km/h

So , Average speed is 57.5 km/h