Question

The temperature at 12 noon was 150C 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?NCERT Class 7th Mathematics Chapter 1 Integers

Answer 1

Answer:

1). at 11:30 pm (23:30); 2). - 9°C

Step-by-step explanation:

15° - 2°h = - 8°

- 2°h = - 8° - 15° = - 23°

h = - 23° ÷ (- 2°) = 11.5 hours

At 11:30 p.m. (23:30) temperature will be - 8°C

At 12:00 a.m. (24:00) temperature will be

15° - 2×12 = - 9°C