Time-Speed-Distance-Train

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A worker reaches his factory 3 minutes late if his speed from his house to the factory is 5 km/hr. If he walks at a speed of 6 km/hr, then he reaches the factory 7 minutes early. The distance of the factory from his house is.....
4 km
no
5 km
yes
6 km
no
7 km
no
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Total time taken by a person in going to a place by walking and returning on cycle is 5 hours 45 minutes. He would have gained 2 hours by cycling both ways. The time taken by him to walk both ways is.....
6 hrs 45 minutes
no
7 hrs 45 minutes
yes
8 hrs 15 minutes
no
8 hrs 30 minutes
no
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A car travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20 km/hr and the last one-third distance with a speed of 60 km/hr. The average speed of the car for the whole journey is.......
18 km/hr
yes
24 km/hr
no
30 km/hr
no
36 km/hr
no
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A bus is moving with a speed of 30 km/hr ahead of a car with a speed of 50 km/hr. How many kilometres apart are they if it takes 15 minutes for the car to catch up with the bus?
5 km
yes
7.5 km
no
12.5 km
no
15 km
no
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A distance is covered in 2 hours and 45 minutes at 4 kmph. How much time will be taken to cover it at 16.5 kmph? 
40 minutes
yes
42 minutes
no
45 minutes
no
90 minutes
no
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A train overtakes two persons who are walking in the same direction in which the train is running, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is……………
72 meter
no
45 meter
no
54 meter
no
180 meter
yes
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A train leaves a station A at 7 am and teaches another station B at 11 am. Another train leaves B at 7 am and reaches A at 10:30 am. The two trains cross one another at....... 
8.0 am
no
8.52 am
yes
9.00 am
no
9.40 am
no
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