Speed, Time and Distance
- A bus covers a distance of 400 km with a speed of 20 km/h. What time is taken by the bus to cover this distance?
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We know that, speed = Distance / Time
Correct Option: D
We know that, speed = Distance / Time
∴ Required Time = Distance / Speed = 400/20 = 20 h
- The speed of a bus is 72 km/h. The distance Covered bye the bus in 5 s is
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Given, speed of bus = 72 km/h = 72 x 5/18 = 20 m/s
Correct Option: C
Given, speed of bus = 72 km/h = 72 x 5/18 = 20 m/s
∴ Distance travelled in 5 s = 5 x 20 = 100 m
- 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
- 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
- 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