Question

a girl ride a bicycle with a speed of 10km/h for 2h and 15km/h for 3 h. Find the distance moved by her and average speed

Answer 1

case 1,
speed=10km
time=2hr
distance=speed ×time
10×2=20km

case 2
speed=15km
time=3hrs
distance=15×3=45km
so total distance covered=45km+20km=65km
now,
average speed=total distance/time
65/5
=13km/hr

Answer 2

Given:

• Speed of the bicycle = 10 Km/h and 15 Km/h
• Time = 2 hrs and 3 hrs

To Find:

• The distance and average speed.

Solution:

The formula to find the distance is given by,

distance = speed×time → {equation 1}

1. Speed = 10 Km/h and time = 2 hrs

On substituting the values in equation 1 we get,

⇒ distance = 10×2 = 20 Km  {multiplying the terms}

2. Speed = 15 Km/h and time = 3 hrs

On substituting the values in equation 1 we get,

⇒ distance = 15×3 = 45 Km {multiplying the terms}

∴ The total distance = 20 + 45 = 65 Km

3. To Find average speed the formula is given by,

avg. speed = total distance/total time → {equation 2}

On substituting the values in equation 2 we get,

⇒ avg. speed = 65/2+3

⇒ avg. speed  = 65/5 = 13 Km/hr {dividing the terms}

∴ The distance moved = 56 Km and average speed = 13 Km/hr