Amey B.

asked • 02/24/16

an express train travelled at an average speed of 100 kmh stopping for 3 minutes after

an express train travelled at an average speed of 100 kmh stopping for 3 minutes after every 75 km how long did it take to reach its destination 600 km from the starting point
 
600/100=6h
 
600/75=8 time halt
8*3=24
 
6.24 min is my answer but real answer is 6.21 how it is
 
 
 

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Bill S. answered • 02/24/16

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The 8th time they were at the destination therefore the wait did not count.
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Amey B.

how can sir can you explain me
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02/27/16

Bill S.

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Sure Amey...The first 75 miles the total is 75 miles and they wait 3 minutes
                       The second 75 miles the total is 150 miles and they wait 3 minutes for a total of 6 minutes
                       The third 75 miles the total is 225 miles and they wait 3 minutes for a total of 9 minutes
                       The fourth 75 miles the total is 300 miles and they wait 3 minutes for a total of 12 minutes
                       The fifth 75 miles the total is 375 miles and they wait 3 minutes for a total of 15 minutes
                       The sixth 75 miles the total is 450 miles and they wait 3 minutes for a total of 18 minutes
                       The seventh 75 miles the total is 525 miles and they wait 3 minutes for a total of 21 minutes
                       The eighth 75 miles the total is 600 miles. They have arrived. The waiting is over (for this trip).
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02/27/16

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