Speed, Time and Distance
- Arjun runs a distance of 1500 m in 5 minutes. What is his speed in Km/hr ?
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Speed in Km/hr = Speed in m/sec x 18/5
Correct Option: B
Speed = (1500/300 ) m/sec
= 5 m/sec
= (5 x 18/5 ) km/hr
= 18 km/hr
- A person goes to his office from his home at the speed of 4 km/h and return back at the speed of 6 km/h. Find the average speed of the person ?
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Average speed = 2ab/(a+b)
= (2 x 4 x 6)/(4 + 6)Correct Option: D
Average speed = 2ab/(a+b)
= (2 x 4 x 6)/(4 + 6)
= 48/10
= 4.8 km/h
- A man covered a distance of 12 km in 90 min by cycle. How much distance will he cover in 3 h, if he rides the cycle at a uniform speed?
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Distance covered in 3 h = Speed x Time
Correct Option: B
We know that, speed = Distance / Time
Speed = 12/90 km/min
∴ Distance covered in 3 h = Speed x Time
= (12/90) x (3 x 60) = 24km
- Two cars are moving in the same direction with their respective speeds of 9 km/h and 5 km/h. Find the relative speed of 1st car with respect of 2nd.
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We know that for relative speed, the subtraction of speeds takes place, if the motions of the two objects are in the same direction.
Correct Option: B
We know that for relative speed, the subtraction of speeds takes place, if the motions of the two objects are in the same direction.
∴ Required relative speed = 9 - 5 = 4 km/h
- Ram and Shyam are moving in the directions opposite to each other. The Speeds of both persons are 10 km/h and 6 km/h, respectively. Find the speeds of Ram with respect of Shyam.
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We know that for relative speed, the two speeds will be added, if the motions of the two objects are in opposite directions.
Correct Option: B
We know that for relative speed, the two speeds will be added, if the motions of the two objects are in opposite directions.
∴ Required speed = 10 + 6 = 16 km/h
