Children sit in a trolley and are moved across a wide and deep river. There is a rope with a pulley in order to move this trolley across the fast-flowing river. Such a trolley is used in ___________.

Keep practicing — related questions

• The river _____ joins the Ganga at Prayag.
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• Directions: Fill in the blank with the suitable article: The Ganga is ____ holy river.
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