Zailan cycles \(12\text{ km}\) in \(40\text{ minutes}.\)
Calculate the speed of his cycling.
A car moves at a speed of \(90\text{ km h}^{-1}.\)
Find the distance, in \(\text{km},\) travelled by the car in \(100\) minutes.
Four cars, \(A,B,C\) and \(D\) departed simultaneously from Sungai Buloh to four different towns.
The table shows the average speed and the distance traveled by each car.
Average speed
\((\text{km/h})\)
Distance
\((\text{km})\)
Nina drove \(10\) minutes from her house to her workplace at an average speed of \(60 \text{ km/h}.\)
When she drove back home, she took \(10\) minutes longer.
Find Nina's average speed, in \(\text{km/h},\) on her return journey.
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