Question

please ans by solving​

Answer 1

Answer:

15 %

Step-by-step explanation:

Answer 2

Answer:

20%

Step-by-step explanation:

Distance = 100 km

Let the time be t.

We know that

Speed = Distance/Time

= 100/t

After increasing the speed by 25%,

Now, speed = 100/t + 25% of 100/t

= 100/t + (25×100)/(100×t)

= 100/t + 25/t

=(100 + 25)/t

= 125/t

Again, Distance = 100 km & speed = 125/t

Time = Distance/speed

= (100×t)/125

=(4/5) t

So, he saved his time = old time - new time

= t - (4/5)t

= (5t - 4t)/5

= t/5

Therefore, he saved his time by percentage = {(t/5)×100}/t

= (t×100)/(5×t)

= 20%