999 mum wrote:
If a train travels half the journey at 24km/hr and then 16km/hr the rest of the journey, and the journey takes 30mins, how far has it traveled?
Sorry to be pedantic, when there is reference to half the journey does the question clarify whether they are talking of journey time or distance?
I think the question is quite clear -
The train completes 1/2 the journey at a speed of 24km/hr & 1/2 at 16km/hr. The time & speeds are given & distance is needed. Because the distance travelled at each speed is 1/2 the total distance, therefore we can arrive at the average speed easily.
I'm saying this because km/hr is the distance traveled in an hour & 24 or 16 are the speed at which the train needs to move to cover a given distance in an hour.