1] The speed of the boat in still water is 10 kmph.If it can travel 24 km down stream and 14 km in the upstream in the equal time,indicate the speed of the flow of the stream.
a]38/100  b]100/38 c ]100+38  d] 100-38

solution:
let speed of flow of water = x
speed of boat downstream =  10+x
speed of boat upstream =  10-x
speed = distance travelled/time => d= st
distance downstream = 24 km
 distance travelled downstream= 24/(10+x)
distance upstream = 14
distance travelled upstream = 14/(10-x)
 since its given that distance covered upstream and down stream is in equal time
 24/(10+x) = 14/(10-x)
240-24x = 140x + 14x
x = 100/38

2] The speed of the boat in still water is 10 kmph.If it can travel 26 km down stream and 14 km in the upstream in th same time,indicate the speed of the flow of the stream.
a]8 b]3 c ]10 d] 2