EXPLANATION
IQ10. A train travels from City A to City B at a constant speed. It covers the first 120 kilometers of the journey in 2 hours. However, due to traffic congestion, it covers the remaining distance of 80 kilometers in 4 hours. What is the average speed of the train for the entire journey?
a) 33.33 km/h
b) 40 km/h
c) 16.67 km/h
d) 36.666 km/h
ANSWER: a) 33.33 km/h
EXPLANATION:
To find the average speed of the train for the entire journey, we need to calculate the total distance traveled and the total time taken.
The train covered the first 120 kilometers in 2 hours and the remaining 80 kilometers in 4 hours. So the total distance traveled is 120 kilometers + 80 kilometers = 200 kilometers.
The total time taken is 2 hours + 4 hours = 6 hours.
To calculate the average speed, we divide the total distance by the total time:
Average speed = Total distance / Total time = 200 kilometers / 6 hours
Calculating this expression:
Average speed = 33.33 kilometers per hour (rounded to two decimal places)
Therefore, the average speed of the train for the entire journey is approximately 33.33 kilometers per hour.
