Question

Mr Joshi drove at a distance of 15 km at uniform speed of 45km/hr.Then he travelled a further 22km at a different speed.If the average speed of the whole journey was 44.4km/hr,what was the speed he drove at for the second part of the journey?

Answer 1

Find the time taken for the First 15km:

Speed = 45 km/h (Given)

Time = distance ÷ speed

Time = 15 ÷ 45 =  1/3 hour

Find the time taken for the whole journey:

Distance = 15 + 22 = 37 km

Speed = 44.4 km/h

Time = Distance ÷ Speed

Time = 37  ÷ 44.4 = 5/6 hours

Find the time taken for the second part of the journey:

5/6 - 1/3 = 1/2 hour

Find the speed for the second part of the journey:

Speed = Distance ÷ time

Speed = 22 ÷ 1/2 = 44 km/h

Answer: The speed at the second part of the journey was 44 km/h

Answer 2

I don't know the answer