और एंड स्टिल वॉटर इज द
Answers
Answer:
⇒ Let x be the speed of the stream.
⇒ Speed of the boat in still water is 8km/hr
⇒ The speed of the boat in upstream is 8−xkm/hr
⇒ The speed of the boat in downstream is 8+xkm/hr
⇒ The time taken by the boat to cover 15km=
8−x
15
hr
⇒ The time taken by the boat to cover 22km=
8+x
22
hr
According to the question,
⇒
8−x
15
+
8+x
22
=5
⇒ 15(8+x)+22(8−x)=5(8−x)(8+x)
⇒ 120+15x+176−22x=5(64−x
2
)
⇒ 296−7x=320−5x
2
⇒ 5x
2
−7x−24=0
⇒ 5x
2
−15x+8x−24=0
⇒ 5x(x−3)+8(x−3)=0
⇒ (x−3)(5x+8)=0
⇒ x−3=0 and 5x+8=0
⇒ x=3 and x=−
5
8
Speed cannot be negative.
∴ The speed of the stream is 3km/hr
Answer:
These can also be said as the advantages of using addressing mode: To give programming versatility to the user by providing such facilities as pointers to memory, counter for loop control, indexing of data, and program relocation. To reduce the number of bits in the addressing field of the instruction.