Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
Secondary 1 | Maths
One Answer Below
Anyone can contribute an answer, even non-tutors.
Hi.can u help to solve question 8???Thank u
Date Posted: 4 years ago
Views: 234
Distance = speed x time
If the distance travelled for first part is 350km,
Distance travelled for 2nd part = 470km - 350km = 120km
Ratio of distance travelled = 350 : 120
= 35 : 12
Since the time taken is the same, this means that the ratio of average speed for 1st part to 2nd part of journey is 35 : 12
Difference in speed = 35 parts - 12 parts
= 23 parts
23 parts = 15km/h since difference also = 15km/h
So 1 part = 15km/h ÷ 23 = 15/23 km/h
Speed for 2nd part = 15/23 km/h x 12
= 180/23 km/h
= 7 19/23 km/h
≈ 7.83 km/h (2 decimal places)
If the distance travelled for first part is 350km,
Distance travelled for 2nd part = 470km - 350km = 120km
Ratio of distance travelled = 350 : 120
= 35 : 12
Since the time taken is the same, this means that the ratio of average speed for 1st part to 2nd part of journey is 35 : 12
Difference in speed = 35 parts - 12 parts
= 23 parts
23 parts = 15km/h since difference also = 15km/h
So 1 part = 15km/h ÷ 23 = 15/23 km/h
Speed for 2nd part = 15/23 km/h x 12
= 180/23 km/h
= 7 19/23 km/h
≈ 7.83 km/h (2 decimal places)
See 1 Answer
360 Tutoring Program