arithmetic - a bus starts with a speed of 30 kmhr and increases its speed every 1 hour by 15 kmhr what is the time taken by it to cover 405 km - skillgun

Distance covered in first 1 hour=30 km,Distance covered in next 1 hour=45 km,
Distance covered in next 1 hour=60 km,
Distance covered in 4th hour=75 km
Distance covered in 5th hour=90 km,
Remaining distance=405-300=105 km,
Speed in 6th hour=105 km/hr
Time taken to cover 105 m=105/105=1 hour,
Total time=6 hours