Question

what is the average speed of a train that covers 80 km in 1 hour, 200 km in 2 hour, and 420 km in 4 hour

Answer 1

To find the average speed of the train over the entire distance covered, we first need to calculate the total distance and the total time.

1. **Total Distance**:
- Distance 1: 80 km
- Distance 2: 200 km
- Distance 3: 420 km

Total Distance = 80 km + 200 km + 420 km = 700 km

2. **Total Time**:
- Time 1: 1 hour
- Time 2: 2 hours
- Time 3: 4 hours

Total Time = 1 hour + 2 hours + 4 hours = 7 hours

3. **Average Speed**:
Average Speed = Total Distance / Total Time
Average Speed = 700 km / 7 hours = 100 km/h

Thus, the average speed of the train is **100 km/h**.