A website Maths Puzzle Numerical Ability Sequence and Series

Find the next term in the series
qaz, wsx, edc, rfv,.... ?

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A website Other Question

Hi! I need help finding the slope of this line and the x and y intercepts.
{{{(1/6)*x+4/3=-(1/2)*y}}}
At 10 a.m two trains started traveling toward each other from stations 287 miles apart.they passed each other at 1.30p.m the same day.If the average speed of the faster train exceeded the average speed of the slower train by 6 miles per hour,find speed of the faster train in miles per hour?