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Answer :

The present position of the elevator is at 10 in above the ground level.

Distance moved by the elevator below the ground level = 350 m

Therefore Total distance moved by the elevator = 350 m + 10 m = 360 m

Rate of descent = 6 m/min.

Total time taken by the elevator

=360m ÷ 6m/min = 60 minutes = 1 hour

Hence, the required time = 1 hour.

- Q.1 Evaluate each of the following: (a) (-30) ÷ 10 (b) 50 ÷ (-5) (c) (-36) ÷ (-9) (d) (-49) ÷ (49) (e) 13 ÷ [(-2) + 1] (f) 0 ÷ (-12) (g) (-31) ÷ [(-30) + (-1)] (h) [(-36) ÷ 12] ÷ 3 (i) [(-6) + 5] ÷ [(-2) + 1]
- Q.2 Verify that a ÷ (b + c) \(\neq \)(a ÷ b) + (a ÷ c) for each of the following values of a, b and c. (?) a = 12, b = – 4, c = 2 (b) a = (-10), b = 1, c = 1
- Q.3 Fill in the blanks: (a) 369 ÷ ___ = 369 (b) (-75) ÷ ___ = -1 (c) (-206) ÷ ___ =1 (d) -87 ÷ ___ = -87 (e) ___ ÷ 1 = -87 (f) _____ ÷ 48 = –1<br (g) 20 ÷ ___ = -2
- Q.4 Write five pairs of integers (a, b) such that a ÷ b = -3. One such pair is (6, -2) because 6 + (-2) = -3.
- Q.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 midnight?
- Q.6 In a class test (+3) marks are given for every correct answer and (-2) marks are given for every incorrect answer and no marks for not attempting any question: (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (ii) Mohini scores -5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly?

- NCERT solutions for class 7 maths chapter 1 Integers
- NCERT solutions for class 7 maths chapter 2 Fractions and Decimals
- NCERT solutions for class 7 maths chapter 3 Data Handling
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- NCERT solutions for class 7 maths chapter 14 Symmetry
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- NCERT solutions for class 7 science chapter 2 Nutrition In Animals
- NCERT solutions for class 7 science chapter 3 Fibre to Fabric
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