Tiêu đề WK7 - Y5 - MATH - HW - ADVANCED MEASUREMENT - AN.docx.pdf ✅

Answer: D. 3 seconds Question 8: Step 1: Legolas can shoot arrows at a rate of 12 metres per second. 1 minute = 60 seconds. Step 2: The distance covered by the arrow in a minute is - 12 * 60 = 720 metres. 720 metres = 720/1000 = 0.72 km. Answer: B. 0.72 km Question 9: Step 1: A rectangular water tank measures 9 metres by 5 metres by 2 metres. The volume of water tank is - 9 * 5 * 2 = 90 cubic metres. 90 cubic metres = 90,000,000 cubic cm. Step 2: A pipe is filling the water tank at a constant rate of 2 500 cubic centimetres per second. The time it would take to fill the tank is - 90,000,000/2500 = 36,000 seconds. 36,000 seconds = 36,000/3600 = 10 hours. Answer: C. 10 hours Question 10: Step 1: Dexter’s new computer can perform 1000 operations per second. 1 second = 1000 operations 3600 seconds = 3,600,000 operations. 1 million = 1,000,000 Step 2: Time it would take to perform 1 million operations is - 1,000,000/3,600,000 = 10/36 = 5/18. ©Scholarly 2025. All rights reserved. All digital content and materials provided are proprietary and protected under copyright law. Any reproduction or sharing of digital files, including screenshots, recordings, or downloads, is strictly prohibited without the prior written consent of Scholarly. 3
Answer: E. 5/18 Question 11: Step 1: A rectangular box has a volume of 2 570 000 cubic millimetres. 1 cubic mm = 1/1000000000 cubic metre Step 2: The volume in cubic metres is - 1/1000000000 * 2 570 000 = 0.00257 cubic metres. Answer: A. 0.00257 cubic metres Question 12: Step 1: Bathroom tiles cost 3 cents per square centimetre. The area of the bathroom floor is 3 square metres. 3 square metres = 30,000 square cm. Step 2: The cost to tile the bathroom is - 30,000 * 0.03 = $900 Answer: C. $900 Question 13: Step 1: A car travelling at a constant rate takes 2 seconds longer to travel one kilometre than it would take to travel one kilometre at 75 kilometres per hour. The time it would take to cover 1 km at 75 kilometres per hour is - t = 1/75 hour. t = 3600/75 = 48 seconds. So, it takes 48 seconds to cover 1 km at 75 km per hour. Step 2: Then, the speed of a car travelling at a constant rate is - S = 1/(48 + 2) = 1/50 km per second. S = 1/50 * 3600 = 72 km per hour. Answer: B. 72 km per hour Question 14: Step 1: Biking at a constant rate of 15 kilometres per hour. 15 km = 1 hour 15,000 metres = 60 minutes 1 metre = 60/15000 minutes. ©Scholarly 2025. All rights reserved. All digital content and materials provided are proprietary and protected under copyright law. Any reproduction or sharing of digital files, including screenshots, recordings, or downloads, is strictly prohibited without the prior written consent of Scholarly. 4