Question

2. A car runs 80 km in 2 hours. If the speed of the car remains the same.
(a) what time will it take to cover 200 km?
(b) how much distance will it cover in 15 minutes?​

Answer 1

Step-by-step explanation:

D = 80km

T = 2hr

S =?

S = D/T = 80/2 = 40km/hr

(a) D = 200km

S = 40km/hr

T = D/S = 200/40 = 5hrs

(b) T = 15min = 15/60hrs = 1/4hrs

S = 40km/hr

D = S*T = 40 * 1/4 = 10km

thanks

Answer 2

ANSWER:

• (a) Time taken to cover 200 km = 5 hrs.

• (b) Distance will it covered in 15 minutes = 10 km.

GIVEN:

• A car runs 80 km in 2 hours.

• The speed of the car remains the same.

TO FIND:

• (a) Time taken to cover 200 km.

• (b) Distance it will cover in 15 minutes.

EXPLANATION:

$\boxed{\bold{\large{\gray{Speed = \dfrac{Distance}{Time}}}}}$

1 km = 1000 m

80 km = 80,000 m

1 hour = 3600 s

2 hours = 7200 s

$\sf Speed = \dfrac{80000}{7200}$

$\sf Speed = \dfrac{800}{72}$

$\sf Speed = \dfrac{100}{9}$

$\sf Speed = 11.11\ ms^{-1}$

(a) Time taken to cover 200 km.

$\boxed{\bold{\large{\gray{Time= \dfrac{Distance}{Speed }}}}}$

Distance = 200 km = 2,00,000 m

Speed = 11.11 m/s

$\sf Time= \dfrac{2,00,000}{11.11}$

$\sf Time= 18,000 \ s$

18,000 s = 18,000/3600 = 5 hrs

Hence the car will take 5 hrs to cover 200 km.

(b) Distance it will cover in 15 minutes.

$\boxed{\bold{\large{\gray{ Distance={Speed}\times{Time}}}}}$

Speed = 11.11 m/s

Time = 15 min = 15(60) = 900 s

$\sf Distance = 11.11 \times 900$

$\sf Distance = 10000\ m$

$\sf Distance = 10\ km$

Hence it will cover 10 km in 15 minutes.