a man in a train notices that he can count 21 telephone posts in one minute.if they are known to be 50 meters apart,at what speed is the train travelling
it is direct and inverse variation
Answers & Comments
smik1
If he can count 21 poles each 50m apart that means that the total distance is 20*50m=1000m=1km
Answers & Comments
time is 20 minutes=1/3 hours
speed is distance/ time
speed=1/(1/3)=3km/h