self Maths Puzzle

A train running at 72 kms per hour crosses acoconut tree standing by the side of the track in 7 seconds.The length of the train is:

Read Solution (Total 3)

72 km=72 *5/18=20 m/s
time=7s
so dis=s*t
20 *7=140 mts
12 years agoHelpfull: Yes(3) No(0)

140 mts.
72000 mts. in 3600 seconds, so in 7 sec=72000*7/3600=140 mts.
12 years agoHelpfull: Yes(1) No(1)
d=st
d=72*(5/18)m*7=140m
8 years agoHelpfull: Yes(0) No(0)

self Other Question

5 mangoes and 4 oranges cost as much as 3mangoes and 7 oranges. What is the ratio of cost of onemango to the cost of one orange? The clinic of a Doctor faces the West. From the backside of his clinic, he walks straight 100 metres then turn to the left and walks 100 metres again. Finally, he turns towards right and stops after walking 50 metres. Now in which direction is Doctor from the starting point?