- A14 min
- B22 min
- C18 min
- D4 min
Step-by-Step Solution
Submarine at m, wreck at m. Change m. Time minutes.
Answer: A) 14 min
A submarine is at the depth shown and sinks at the steady rate written beside it. After how many minutes will it be level with the wreck?
Class 7Integers (Extended)Integers
Key idea: Dividing integers
The sign rule for division is **the same as for multiplication**: same signs → positive, different signs → negative.
12 ÷ 4 = 3
(−12) ÷ (−4) = 3
12 ÷ (−4) = −3
(−12) ÷ 4 = −3
Also: integer ÷ 1 = the integer; integer ÷ itself = 1; **never divide by 0** — division by zero is undefined.
12 ÷ 4 = 3
(−12) ÷ (−4) = 3
12 ÷ (−4) = −3
(−12) ÷ 4 = −3
Also: integer ÷ 1 = the integer; integer ÷ itself = 1; **never divide by 0** — division by zero is undefined.
Master this chapter in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Integers (Extended) practice questions
More Class 7 Integers (Extended) practice
In this quiz a correct answer gets +3 and a wrong answer gets −1. Meera answered all 20…Kiran uses the two number cards with the operation chips. Which statement is FALSE?Each floor of this building is 4 m high. The lift goes from where it is now to the floor…The bar chart shows a juice stall's profit (+) or loss (−) for six months in thousands…Pick any three of these cards and multiply the numbers on them. What is the greatest…