A train travels 60km in M minutes. If it's average speed is 400km per hour find the value of M?

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Answer 1 · 2018-08-05T19:49:30

the value of M is 9 min.

D = RT

The distance D = 60 km
the rate R = 400km/hr
M = the time in mins.

Substitute the values into the D =RT equation and solve.

Change the Rate to 400 km/60 min

$60 km = (400km)/60 min xx M$

Multiply both sides by the inverse of the Rate

$60 xx 60 min/400km = ( 400km)/60 min xx 60 min/(400km) xx M$

This gives

$( 3600 min xx km )/(400 km) = M$

Dividing gives

$9 min = M$

Answer 2 · 2018-08-05T21:06:45

$"speed"=("distance")/("time")$

$"time"=("distance")/("speed")$

$"time"=(60)/400=3/20$

$1/20$ of an hour is 3 minutes so $3/20$ is 9 minutes