Question

Abc me kor b bhi Sam kor hai yadi .AC=8,BC=4 Toh ab ka man giiyant ki giya

Answer 1

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45

Let original speed =xkm/hr

⇒  Time taken to travel =x90hr

⇒  New speed =(x+15)km/hr

⇒  Time taken to travel =x+1590hr

∴  x90=x+1590+21

⇒  x90−x+1590=21

⇒  90(x1−x+151)=21

⇒  x(x+15)x+15−x=1801

⇒  15×180=x(x+15)

⇒  2700=x2+15x