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Answer 1 · 2017-08-23T13:21:08

#7.2m#

enter image source here

At this situation, the ratio of heights and the length are same

So,

#rarr9/5=x/4#

#rarrx=9/5 *4#

#rarrx=36/5#

#color(green)(rArrx=7.2m#

Hope this helps!!!☺