Boats & Streams, Planes - Head Wind & Tail Wind (Aptitude) Problems: Tricks & Concepts

Mayank explains the following key concepts of Speed Problems with Moving Surface.
Speed Problems with Surface Moving @0:5
Relative Speed of Boat/Plane: Terms and Concepts @3:50
A Boat can Travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 80 km downstream @11:29
Speed of the swimmer when downstream is 16 km/hr, speed of the current is 3 km/hr, So the speed of the swimmer against the current will be? @12:26
A boat covers 36 km downstream and 12 km upstream in 6 hrs each. What is the velocity of the current? @13:12
A man can row 18 kmph in still water. It takes him thrice as long to row down the river. Find the speed of the stream @
A small airplane flying with a head wind takes 3 hours to travel 600 miles. However, when flying with a tail wind, the airplane can travel the same distance in only 2 hours. Find the speed of the wind? @16:34
A boat running upstream takes 8 hours to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively? @18:08
Rahul can travel 12 miles downstream in 6 hours less than sarne distance up stream. But if he could double his rowing rate for his 24 miles round trip, the downstream 12 miles would then take only one hour less than the upstream 12 miles. What is the speed of the current? @19:41
A ship 4 km from the shore has leak admitting 15 tons of water would sink it. Pumps can throw out 12 tons of water per hour. Find the final distance travelled by boat as it tries to move across the stream moving at 1 km/hr to reach the shore before it sinks @25:39
Next Class: Speed of Object with Size @28:39
#Stream #Velocity #Upstream #Downstream #Swimmer #Surface #Mayank #Examrace

Next: Problems on Trains and boats

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