Question 20
Khoa’s family is walking from their house to the park for exercise. The distance from their house to the park is 1.8 km (which is 1,800 meters). They start walking at 7:00 a.m. Khoa’s family walks through different sections of the route at different speeds:
- Section 1: On the first 600 meters, they go up a slope and can only walk at a speed of 40 meters per minute.
- Section 2: After the slope, on the next 900 meters of flat road, they increase their speed to 75 meters per minute.
- Section 3: On the remaining distance to the park, they slow down to enjoy the scenery and walk at 30 meters per minute. At what time does the family arrive at the park?
- Section 1: On the first 600 meters, they go up a slope and can only walk at a speed of 40 meters per minute.
- Section 2: After the slope, on the next 900 meters of flat road, they increase their speed to 75 meters per minute.
- Section 3: On the remaining distance to the park, they slow down to enjoy the scenery and walk at 30 meters per minute. At what time does the family arrive at the park?