Speed, Time and Distance
- A train is running with the speed of 45 km/hour. What is its speed in meter per second ?
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Speed of a train in kilometer per hour = 45
Speed in meter per second = ( 5/18 ) x Speed in kilometer per hour
Correct Option: A
speed of a train in kilometer per hour =45
Speed in meter per second = ( 5/18 ) x Speed in kilometer per hour
= 45 x 5/18
= 12.5 kmph
- If a motor car covers a distance of 250 m in 25 second, What is its speed in kilometer per hour ?
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Speed of the motor car in meter per second = 250 / 25
= 10 m/s
Speed in km/hr = (18/5) x speed in m/sCorrect Option: D
Speed of the motor car in meter per second = 250 / 25
= 10 m/s
Speed in km/hr = (18/5) x speed in m/s
= 10 x (18 / 5) km/hour
=36 km/hour.
- A man takes 4 h 20 min in walking to a certain place and riding back. If he walk on both sides he losses 1 h. The time he would take by riding both ways is ?
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W + R = 4 h 20 min
W + W = 5 h 20 minCorrect Option: B
W + R = 4 h 20 min
W + W = 5 h 20 min
∴ R + R = 3 h 20 min
- A boat moves downstream at 1 km in 5 minutes and upstream at 1 km in 12 minutes.What is the speed of current?
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Sd = 12 km/h
Su = 5 km/h
Speed of current = (Sd - Su)/2Correct Option: B
Sd = 12 km/h
Su = 5 km/h
Speed of current = (12 - 5)/2 = 3.5 km/h
- 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