5. The temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero? What would be the temperature at mid-night?

Answers (1)

Given,

Temperature at 12 noon = 10^{\circ}C

Final temperature = -8^{\circ}C

\therefore Decrease in temperature = 10 - (-8) = 18^{\circ}C

Time taken for the temperature  to decrease by 2^{\circ}C1\ hour

\therefore Time taken for the temperature  to decrease by 18^{\circ}C

=\frac{1}{2}\times18\ hour

= 9\ hours

Now,

Time until mignight = 12\ hours

\therefore Decrease in temperature in 12\ hours = 2\times12 = 24^{\circ}C

Therefore, temparature at midnight = (10 - 24)^{\circ}C = -14^{\circ}C

Therefore, temperature at mid-night will be 14^{\circ}C below zero.

Preparation Products

JEE Main Rank Booster 2021

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 13999/- ₹ 9999/-
Buy Now
Rank Booster NEET 2021

This course will help student to be better prepared and study in the right direction for NEET..

₹ 13999/- ₹ 9999/-
Buy Now
Knockout JEE Main April 2021 (Easy Installments)

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 4999/-
Buy Now
Knockout NEET May 2021

An exhaustive E-learning program for the complete preparation of NEET..

₹ 22999/- ₹ 14999/-
Buy Now
Knockout NEET May 2022

An exhaustive E-learning program for the complete preparation of NEET..

₹ 34999/- ₹ 24999/-
Buy Now
Exams
Articles
Questions