A boy in the car notices that he can count 21 shops which are evenly spaced on a highway in one minute. If they are known to be 100 meter apart, then at what speed is the train travelling?

Options
- 60 kmph
- 100 kmph
- 120 kmph
- 180 kmph

CORRECT ANSWER : 120 kmph

Discussion Board
solution

Distance travelled between between 21 shops=(n-1)*100
=20*100
=2000 m
Time taken to see 21 shops=(n-1)=20 min
=1200 s
Speed to see one shop= 2000/1200
=5/3 m/s
=5/3*18/5
=6 kmph
speed to see 21 shops=(n-1)*6
=20*6 = 120 kmph

Ashish Kumar Jha 05-14-2020 08:43 AM

Solution

Distance covered in 1 minute= Distance between 21 shops which are 100 m. apart=20*100=2000 m. (since starting and ending will not be considered) speed= dist/time
speed=2km*60=120 km/h

Nikita 08-30-2018 08:18 AM

Help

Anyone can help me this solution ??

Yeshi 07-24-2018 02:21 AM

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