Question

The distance from Thrissur to Ernakulam is 75 km. Then what is the speed of Kerala Express if the train is at right time? *
1 point
2 km/hr
50 km/hr
20 km/hr
40.9 km/hr​

Answer 1

Answer:

20km/hr

Step-by-step explanation:

Answer 2

SOLUTION

TO CHOOSE THE CORRECT OPTION

The distance from Thrissur to Ernakulam is 75 km. Then what is the speed of Kerala Express if the train is at right time ( time taken = 1 hr 50 min)

• 40.9 km/hr

• 20 km/hr

• 2 km/hr

• 50 km/hr

EVALUATION

Here it is given that the distance from Thrissur to Ernakulam is 75 km.

So distance = 75 km

Again time taken to travel

= 1 hr 50 min

$\displaystyle \sf{ = \bigg(1 + \frac{50}{60} \bigg) \: hour }$

$\displaystyle \sf{ = \bigg(1 + \frac{5}{6} \bigg) \: hour }$

$\displaystyle \sf{ = \bigg( \frac{5 + 6}{6} \bigg) \: hour }$

$\displaystyle \sf{ = \bigg( \frac{11}{6} \bigg) \: hour }$

Hence the required speed of Kerala Express if the train is at right time

$\displaystyle \sf{ = \frac{Distance \: \: covered}{ Time \: \: taken } }$

$\displaystyle \sf{ = \frac{75}{ \frac{11}{6} } } \: \: km/h$

$\displaystyle \sf{ = \frac{75 \times 6}{ 11} } \: \: km/h$

$\displaystyle \sf{ = \frac{450}{ 11} } \: \: km/h$

$\displaystyle \sf{ = 40.9 } \: \: km/h$

FINAL ANSWER

Hence the correct option is 40.9 km/hr

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