Question
Which of the following elements is a
semiconductor?Solution
Silicon element is a semiconductor.
A boat running downstream covers a distance of 55 km in 5 hrs and covering the same distance upstream in 11 hrs. What is the speed of a boat in still wa...
The duration needed to travel (x – 36) km upstream equals the time taken to go (2x – 72) km downstream. If the boat’s speed is 10.5 km/h and the c...
Find the total distance covered by boat in each upstream and downstream in 6 hours if the speed of boat in still water and speed of current is 15 km/h a...
The speed of the boat in still water is 10 km/hr and the speed of the stream is 5 km/hr. A boat goes 75 km downstream with its usual speed but at the ti...
A swimmer can swim at a speed of 3.5 kilometers per hour in still water. If the time taken to cover a certain distance upstream is 2.5 times the time ta...
A boat covers 13 km upstream in 52 min. If the speed of the current is 6 km / h, then in how much time will it cover 40 km downstream?
A man can row boat at 9 kmph in still water. If the velocity of the current is 6 kmph and he takes 2 hour to row to a place and come back, how far is th...
A man rows to a place 42 km away and comes back to the starting point. If the speed of the stream is 2 km/hr and the speed of the boat in still water is...
A boat moves upstream at 18 km/hr. If it covers 270 km downstream in 5 hours, determine the speed of the current.
Speed of a boat in still water is 12 kmph and speed of stream is 9 kmph. A man rows to a place at a distance of 63 km and come back to starting point. T...
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