Question

A car is traveling at a speed of 20 km per hour. It increases its speed by 15km per hour . Find that time when its speed will be 110 km per hour.

Answer 1

6 hour is a time when its speed will be 110 km per hour

Answer 2

Answer:

Step-by-step explanation:

I hope this helps you

Speed of car at 1st hour is 20 km=a

Difference in speed for hour is15km=d

Required ap is

20,35......110

According to problem

An=110

110=a+(n-1)d

110=20+(n-1)15

110-20/15=n-1

90/15=n-1

6+1=n

n=7

Therefore after 7 hours speed of car is 110km