Answers

2014-11-13T05:56:48+05:30
His speed is 48kmph
60 minutes he goes 48000m
1 minute he will go 48000/60
                            =800m

In 800 m no of telegraph posts is 800/50 ...........(since they are 50m apart) 
                                                =16

So he will cross 16 telegraph posts per minute.
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2014-11-13T06:09:07+05:30
speed = 48 km / hour

distance in meres = 48000 m

distance travelled in one minute = 48000/60

= 800 m

therefore number of posts = 800/50

= 16 posts.
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