Question

answer as soon as possible
no spam

step by step explanation​

Answer 1

he is 55th one

let's take first arival as 1

second as 2 and so on........

according to question we will get 1 will be denntioned for 10 minutes

so let's write it as

1=10minutes

so we have to now find

9hrs 10 min=?

it can also be written as

[(9*60)+10] min (since 1 hour=60minutes)

it will be 550 minutes

so 550 minutes =?

10 minutes =1

cross multiply

we get 550÷10=?

55 is the answer

Answer 2

Step-by-step explanation:

GIVEN

Arthimatic progression = 10 minutes,20minutes,30minutes,40minutrs..........................9hours10miutes(550 minutes)

TO FIND

The 550minutes term

FOUND

an=a+(n-1)d

550minutes=10+(n-1)10. {a=first term

d=difference n=no of term}

550=10+10n-10

550=10n

n=550÷10

n=55th term

so,the student is 55 times late.