A train travels 60 km at a speed of 30 km/h and another 120 km at a speed of 60 km/h. What is the average speed of the train for the entire journey? *40 km/h45 km/h50 km/h55 km/h
Question
A train travels 60 km at a speed of 30 km/h and another 120 km at a speed of 60 km/h. What is the average speed of the train for the entire journey? *40 km/h45 km/h50 km/h55 km/h
Solution
To find the average speed of the entire journey, we need to divide the total distance travelled by the total time taken.
Step 1: Calculate the total distance travelled. The train travels 60 km at a speed of 30 km/h and another 120 km at a speed of 60 km/h. So, the total distance travelled is 60 km + 120 km = 180 km.
Step 2: Calculate the total time taken. The time taken to travel 60 km at a speed of 30 km/h is 60 km / 30 km/h = 2 hours. The time taken to travel 120 km at a speed of 60 km/h is 120 km / 60 km/h = 2 hours. So, the total time taken is 2 hours + 2 hours = 4 hours.
Step 3: Calculate the average speed. The average speed is the total distance travelled divided by the total time taken. So, the average speed is 180 km / 4 hours = 45 km/h.
So, the average speed of the train for the entire journey is 45 km/h.
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