Question

a motor boat can travel at 10 kmph in still water. it travelled 91 km downstream in river and then returned, taking altogether 20 hours. find the rate of flow of the river.

Answer 1

$x \times y \div y4564 |x24|$
is that what

Answer 2

Answer:

Strangeness conservation requires the total strangeness of a reaction or decay (summing the strangeness of all the particles) is the same before and after the interaction. Strangeness conservation is not absolute: It is conserved in strong interactions and electromagnetic interactions but not in weak interactions.