There are 180 minutes between 3 o'clock and 6 o'clock.

let x be the number of minutes to 6 o'clock.

Then it is 180 - x minutes past 3 o'clock and 50 minutes ago it is 180 - x - 50 = 130 - x minutes past 3 o'clock.

Using the 4 times as many minutes past three o'clock part we can form the equation

130 - x = 4x

by solving we find

x = 26 min

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it is 26 minutes until 6 o'clock.