Question
The speed of current is 4 km/h. What will be the
respective downstream speed and upstream speed of a boy rowing a boat, if half of the distance covered going downstream in a certain time is equal to the distance covered going upstream in the same time?Solution
Let the speed of boy in still water be X km/h. And the speed of current = 4 km/h Downstream speed = (X + 4) km/h Upstream speed = (X – 4) km/h Let time be ‘t’ hours. ⇒ [(X + 4) t]/2 = (X – 4) t ⇒ X + 4 = 2X – 8 ⇒ X = 12 km/h Downstream speed = 12 + 4 = 16 km/h Upstream speed = 12 – 4 = 8 km/h
Which cytoplasm is most commercially used in hybrid seed production of onion?
Match List-I with List-II and select the correct answer using the codes given below the lists.
Edible part of Saffron is ____
Kranz anatomy type photosynthesis is shown by
Blind hoeing is possible in:
Which one of the following is ICAR’s research repository for research management?
The yield of forest is regulated on the basis of volume by using following:
Physical dormancy caused by hard seed coat is overcome by
Which pest of sugarcane is characterized by the symptom of internodes becoming constricted and shortened with multiple boreholes and frass in the nodal ...
Foodgrains and oilseeds are dried to how much moisture level?
Relevant for Exams:
