Question

Q. 12 Yashvi rides a bicycle at a uniform speed. If the speed had been 4 km/hr more,
it would
have taken 1 hourless to travel 48 km distance. Determine her speed.
​

Answer 1

Answer:

D= 48

let speed be X

then

T= 48/X

new speed= X+4

T= 48/X+4

According to the question

48/X+4 = 48/X - 1

solve by yourself now

Answer 2

Answer:

speed= 12 km/hr

Step-by-step explanation:

Given: Yashvi rides a bicycle at a

uniform speed.

If the speed had been 4 km/hr more, it

would have taken 1 hour less to travel 48

km distance.

To Find: Determine the speed

Solution:

Let say Speed S km/hr

Distance = 48 km

Time Distance / Speed

Time Taken = 48/S hr

speed had been 4 km/hr more

=>Speed = S+4 km/r

Time taken = 48/(S +4)

Time Taken hour less = 48/S 1

48/(S+4) = 48/S -1

=>48S = 48(S +4) - S(S + 4

=> 48S = 48 +192 - S -4S

=>S +4S - 192 0

=> S+16S 12S-192 0

=> S(S +16) 12(S+16) = O

=> (S - 12)(S + 16) = 0

>S=12 or S=-16 ( not possible as

Speed can not be negative)

Speed 12 km/hr

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