Question

3. Sheela travels by bus from Haridwar to New
Delhi. The distance between the two places is
approximately 210km. The bus takes 5 hours to
reach. What was the speed of the bus?​

Answer 1

Answer:

42Km/h

Explanation:

distance= 210km

time = 5h

Speed = distance/ time

= 210km/5h

= 42 km/hour

Answer 2

★ Given:-

• The distance between two places = 210 km.
• In a bus, it takes 5 hours to reach.

★ To Find:-

The speed of the bus.

★ Solution:-

Distance = 210 km

Time = 5hrs

To find the speed, use the formula:-

$\red \star \: \: \red{\underline{\boxed{\bf{ Speed \ = \frac{ Distance }{Time} }}}} \: \: \red \star$

$\red{{{\sf{ Speed \ = \frac{ 210 \: km }{5 \: hrs} }}}}$

$\red{{{\sf{ Speed \ = \cancel\frac{ 210^ \: \: km}{ 5 \: hrs} }}}}$

$\red{{{\sf{ Speed \ = \frac{ 42 \: km }{1 \: hrs} }}}}$

∴ The speed of the bus = 42 hrs.

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Problems on the time of people:-

A train 150 m long is standing at a speed of 60 km/hr. How much time will it take to cross a standing man on the platform?

Solution:-

Speed of the train = 60 km/hr = ${{{\sf{ 60 \ \times \large\frac{5 }{18} }}}} \: \: \small{{{\sf{m/sec}}}} \: \: \: \: = {{{\sf{ \large\frac{5 0}{3} }}}} \: \: \small{{{\sf{m/sec}}}}$

Distance covered in crossing a standing man = length of the train = 150 m

Use the formula:-

$\red \star \: \: \red{\underline{\boxed{\sf{ Time \: taken \ = \frac{ Distance }{Speed} }}}} \: \: \red \star$

$= {{{\sf{ \large\frac{ 150 \: m} { \large\frac{50}{3} } \:{{{ \sf{ { \small m/sec}}}}}}}}}$

$= {{{\sf{ \frac{150 \times 3}{50} }}}} \: {{{ \sf{ { \small sec}}}}} = \: {{{ \sf{{ \small9 \: sec}}}}}$

∴ The the train will take 9 seconds to cross a standing man.

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