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A bus running with the initial speed of 21 km/hr and its speed increases every hour by 3 km/hr. How many distance travels by bus in 4 hours?
1. 108 km
2. 102 km
3. 99 km
4. 105 km

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Correct Answer - Option 2 : 102 km

Given:

Initial speed of bus = 21 km/hr

Speed increases by 3 km/hr every hour

Time = 4 hours

Calculation:

Speed in 1st hour = 21 km/hr

Speed in 2nd hour = 24 km/hr

Speed in 3rd hour = 27 km/hr

Speed in 4th hour = 30 km/hr

Total distance covered in 4 hours = (21 + 24 + 27 + 30) km

∴ Total distance traveled by bus in 4 hours is 102 km

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