A car travel 30km at a uniform speed of 40km/h and the next 30km at a uniform speed of 20km/h. Find average speed

26.67 km/h

Explanation:

A car travelling 30 km at 40 km/h will reach the destination in 0.75 hours.

Travelling 30 km at 20 km/h takes 1.5 hours.

So in this scenario, the car took 0.75 hours + 1.5 hours = 2.25 hours to travel a total of 60 km. The average speed would be 60/2.25 = 26.67 km/h.

c. is the best answer

in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.