Speed, Time and Distance
- A speed of 55 m / sec. is the same as ?
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Speed in km/hr = speed in m/sec x (18 / 5 )
Speed in km/hr = (55 x 18 /5 ) km/hrCorrect Option: A
Speed in km/hr = speed in m/sec x (18 / 5 )
Speed in km/hr = ( 55 x 18 /5 ) km/hr
= 198 km/hr.
- A speed of 22.5 m/sec. is the same as ?
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Speed in km/hr = speed in m/sec x (18 / 5 )
Speed in km/hr = (22.5 x 18 /5 ) km/hr.Correct Option: B
Speed in km/hr = speed in m/sec x (18 / 5 )
Speed in km/hr = (22.5 x 18 /5 ) km/hr
= 81 km/hr.
- A and B are two towns. Mr. Faruqui covers the distance from A to B on cycle at 16 km/hr. however, he cover the distance from B to A on foot at 9 km/hr. his average speed during the whole journey is ?
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Average Speed = Total distance / time
= 2d / [( d / 16) + ( d / 9)]Correct Option: C
Average Speed = Total distance / time
= 2d / [( d / 16) + ( d / 9)]
= ( 2 x 16 x 9 ) / ( 16 + 9 ).
= 11.52 km/hr.
Shortcut :
Average speed = 2uv / (u + v)
= ( 2 x 16 x 9 ) / ( 16 + 9 )
= 11.52
- A man crosses a streets 600 m long in 5 minutes. His speed in km per hour is ?
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Speed = 600 / (5 x 60) m/sec.
Correct Option: A
Speed = 600 / (5 x 60) m/sec.
= 600 / (5 x 60) x 18/5 km/hr.
= 7.2 km/hr.
- if a man cover 10.2 km. in 3 hours. The distance covered by him in 5 hours is ?
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Speed = 10.2 / 3 km/hr.
= 3.4 km/hr.
Distance covered in 5 hours = 3.4 X 5 km.Correct Option: D
Speed = 10.2 / 3 km/hr.
= 3.4 km/hr.
Distance covered in 5 hours = 3.4 X 5 km.
= 17 km
