Question

)1A man walks 20km in 4 hr .Find his speed in (1)km/hr (2)m/s
2)A car travels at a speed of 40 km per hour for 10 minutes then at 55 km per hour 20 minutes and finally 20 minutes km per hour for 20 minutes what is the average speed of the car ?​ please answer please answer ,if you know please right clearly so that I can understand​

Answer 1

Answer:

Time taken to cover 20 km at speed 5 km/hr = 4 hours

∴ Fixed time = 4 hour - 40 minutes = 3 hour 20 min

Time taken to cover 20 km at the speed 8 km/hr = 20/8 = 2 hours 30 minutes

∴ Required time = 3 hours 20 minutes - 2 hr 30 min

=50 minutes