Question

A motor bike starts at the speed of 60 kmph with is speeding increasing by 12​

Answer 1

Answer:

Initial speed of motor = 70 kmph.

Distance covered in first 2 hours = 2 × 70 = 140 kms.

For next two hours speed of motor = 80 kmph.

∴ Distance covered in next 2 hours = 2 × 80 = 160 kms.

Distance covered in first 4 hours = 140 + 160 = 300

Remaining distance = 345 - 300

= 45 km

This distance will be covered at the speed of 90 kmph.

∴ Time taken = 4590 = 12hour

∴ Total time taken

= 4+12 = 412hours

Answer 2

Answer:

7 hour

Step-by-step explanation:

First 3hour: 180 km covered (60*2)

second 3hour: 216km covered (72*3)

=(60+12=72)

Total distance: 396

After this, the speed becomes 84 km/h so distance in hour= 84(72+12)

Total distances (current) : 396+84=480

Total time= ( first 3 hours) + ( second 3 hours)

+(extra hour when it changed to 84kmph)

=3+3+1=7

hope it will help you ❤️