Question

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

Answer 1

Step-by-step explanation:

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