Question

A car travels 50 km in 1 hour and 40 km in next 30 min. What is the average speed of whole journey

Answer 1

Answer:

Given distance = 50 km in 1 hour

and 40 km in 1/2 hours or 30 mins

Let the average speed be x km/h

Now ,we know that distance / speed = time

= 50/x + 40/x = 1 + 1/2

= 50/x+ 40/x = 3/2

= 90x/x²= 3/2

= 3x² = 180x

= x² = 60 x

= x = 60km / H