46.  A man walking at the rate of 5 km/hr crosses a bridge in 15 minutes. the length of the bridge (in meters) is?


600
750
1000
1250


Answer

 Option

Speed = (5*5/18) m/sec = 25/18 m/sec. Distance covered in 15 minutes = (25/18*15*60) m =1250 m.

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47.  A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?


3.6
7.2
8.4
10


Answer

 Option

Speed = (600/5*60) m/sec =2 m/sec = (2* 18/5) km/hr = 7.2 km/hr.

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48.  Which of the following trains is the fastest?


25 m/sec
1500 m/min
90 km/hr
None of these


Answer

 Option

25 m/sec = (25 * 18/5) km/hr = 90 km/hr. And 25 m/sec = (25 * 60) m/min = 1500 m/min. So, all the three speeds are equal.

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49.  An athlete runs 200 meteres race in 24 seconds. his speed is?


20 km/hr
24 km/hr
28.5 km/hr
30 km/hr


Answer

 Option

Speed = 200/24 m/sec = 25/3 m/sec = (25/3 * 18/5) km/hr = 30 km/hr.

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50.  A car moves at the speed of 80 km/hr. What is the speed of the car in metres per second?


8 m/sec
20 1/9 m/sec
22 2/9 m/sec
none of these


Answer

 Option

Speed = (80 * 5/18) m/sec = 200/9 m/sec = 22 2/9 m/sec.

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