Crosswords0 min ago
Daily Mail Mindbender 2 Dec
5 Answers
Im sure ive solved similar in past but cant get a a handle method to solve ie
'Jamilah and Mick Cars race round circular track constant speed start at same point in opposite directions and meet every 30 seconds. Moving in sme direction they meet every 120 seconds.
Track 1800 metres circumference and Jamilah slowest how fast Mick.
Tia
'Jamilah and Mick Cars race round circular track constant speed start at same point in opposite directions and meet every 30 seconds. Moving in sme direction they meet every 120 seconds.
Track 1800 metres circumference and Jamilah slowest how fast Mick.
Tia
Answers
Best Answer
No best answer has yet been selected by ginger1945. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.In 30 seconds the total distance travelled going in opposite directions = 1800m
Combined Speed = 1800 / 30= 60 metres per second
In 120 seconds therefore the combined distance travelled = 120 * 60 = 7200 metres
7200 / 1800 = 4 laps
Therefore Mick is travelling 4 times as fast as Jamilah
60metres per second * 4/5 = 48 metres per second and Jamilah 12 metres per second
Check
30 seconds
Mick 48 * 30 = 1440 metres
Jamilah 12 * 30 = 360 metres
Total = 1800 meters = correct so far
120 seconds
Mike = 120 * 48 = 5760 yards
Jamilah = 120 * 12 = 1440 yards
Total = 7200 yards
Combined Speed = 1800 / 30= 60 metres per second
In 120 seconds therefore the combined distance travelled = 120 * 60 = 7200 metres
7200 / 1800 = 4 laps
Therefore Mick is travelling 4 times as fast as Jamilah
60metres per second * 4/5 = 48 metres per second and Jamilah 12 metres per second
Check
30 seconds
Mick 48 * 30 = 1440 metres
Jamilah 12 * 30 = 360 metres
Total = 1800 meters = correct so far
120 seconds
Mike = 120 * 48 = 5760 yards
Jamilah = 120 * 12 = 1440 yards
Total = 7200 yards
If they travel 4 laps before they meet again then it means that
Mikes speed is Jamilah's speed + 1/4 of Jamilah's speed
Mike = 1.25 Jamilah's speed
60 metres per second = 2.25 Jamilah
Jamilah = 60/2.25 = 26.67 metres per second
Mike =33.33 metres per second
In 120 seconds Jamilah hasgone 26.67 * 120= 3200 metres
Mike has gone 4000 metres
Mikes speed is Jamilah's speed + 1/4 of Jamilah's speed
Mike = 1.25 Jamilah's speed
60 metres per second = 2.25 Jamilah
Jamilah = 60/2.25 = 26.67 metres per second
Mike =33.33 metres per second
In 120 seconds Jamilah hasgone 26.67 * 120= 3200 metres
Mike has gone 4000 metres
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