Sanjeev a student of class X, …

Sanjeev a student of class X, goes to Yamuna river with his friends. When he saw a boat in the river, then he wants to sit in boat. So his all friends are ready to sit with him. In this order, Sanjeev is sitting on a boat which upstream at a speed of 8km/h and downstream at a speed of 16 km/h. When Sanjeev is in the boat, some questions are arises in the mind, then answer the given questions. 1. The speed of the boat in still water is :- (a) 8km/h (b) 10km/h (c) 12km/h (d) 14km/h 2. The speed of stream is :- (a) 3km/h (b) 4km/h (c) 6km/h (d) 6km/h 3. Which mathematical concept is used in above problem?(a) Pair of linear equations (b) Cross-multiplication method (c) Factorisation method (d) None of the aboveThe direction in which the speed is maximum, is :- (a) upstream (b) downstream (c) both have equal speed (d) none of these 5. The average speed of stream and boat in still water is :- (a) 7km/h (b) 10km/h (c) 12km/h (d) 5km/h​

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sin60° cos 30°+ cos60° sin 30°

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