Question

A car proceeds journey at 70 km per hour.it increase the speed at the rate of 10km in every 2 hours. how many hours it takes to cover the distance of 345 Kms?​

Answer 1

Step-by-step explanation:

he will take 3 hour and 30 minutes

Answer 2

Answer:

Distance covered in the first 2 hours = (70 x 2) km = 140 km

Distance covered in the next 2 hours = (80 x 2) km = 160 km

Remaining distance = 345 - (140 + 160) = 45 km Now, speed in the fifth hour = 90 km/hr

∴ Time taken to cover 45 km = (

90

45

)hr=

2

1

hr

∴ Total time taken = (2+2+

2

1

)hr=4

2

1

hrs

one more method

motor car starts with the speed of 70 km/hr with its speed increasing every two hours by 10 kmph. In how many hours will it cover 345 kms? Remaining distance = 345 – (140 + 160) = 45 km.