Question

shalu cycles to her school at an average speed of 12 kilometre per hour it takes her 20 minute to reach the school if she went to reach her school in 15 minutes what should be her average speed? ​

Answer 1

Answer:

case1:

speed = 12kmph.

time = 20 mins = 1/3 hours.

distance = speed × time = 12 × 1/3 = 4km.

case2:

distance = 4km.

time = 15 mins = 1/4 hours.

speed = distance ÷ time = 4 × 4 = 16 kmph.

Answer 2

Given that ⏩

• Speed = 12 km/hr
• Time taken = 20 min .
• If time taken become = 15 min , then speed = ?

Solution ⏩

☆ As we know that Speed = Distance/ Time .

Speed = 12 km/hr

Time = 20 min .

Time in Hour will

20/60 hour → 1/3 hour

So distance = Speed × Time

➡️ 12 × 1/3

➡️ 4 km

Now if she wants to reach school in 15 min

then Speed = Distance× Time

15 min = 15 /60

➡️ 1/4 hr

New Speed = Distance/Time

➡️ $\frac{4}{1/4}$

➡️ 4×4 = 16 km/hr

Hence required speed is 16 km/hr