Question

At a shopping mall, the air conditioner is set so that it reduces temperature at the rate of $4^o$C every hour. If at $10$ a.m. the temperature inside the mall was ${35}^o$C, what will be the temperature inside the mall at $6$ p.m.?

• A. $4^o$C
• B. $6^o$C
• C. $3^o$C
• D. $7^o$C

Answer 1

Answer: (C)

$3^o$C

At $10$ a.m., temperature inside the mall $={35}^o$C
As temperature reduces by $4^o$C every hour

Time difference between $10$ am and $6$ pm is $8$ hours.
$\therefore$ At $6$ p.m., temperature inside the mall
$=(35-(4\times 8){)}^{o}C=(35-32{)}^{o}C=3^o$C.