Brainly.inWhat is your question?packerpacker22.06.2018PhysicsSecondary School+5 ptsAnsweredA train travels the first 15 km at a UNIFORM speed of 30 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. CALCULATE the average speed for the ENTIRE train journey.Solution :Question 40:A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey2SEE ANSWERSLog in to add commentAnswer Expert Verified4.5/5154SmãrtyMohïtGenius2.3K answers597.4K people helpedHere is your solutionGiven :-First 15 km at a uniform speed of 30km/h.Next 75km at at a uniform speed of 50km/h.Last 10km/h at a uniform speed of 20km/h.Time 1st = distance /speed = 15/30Time 2nd = distance /speed = 75/50Time 3rd = distance /speed = 10/20Total distance = 15km+75km+10km = 100kmHence,Average speed of train is 40km/hHope it helps you