Question

8. John started a journey from his house at 7:30 in the morning to go to the nearest town to attend a meeting. He drove his car at an average speed of 40 km/h and reached the town at 10 a.m. Find out the speed with which he could have driven the car to reach the town at 9:30 a.m. ​

Answer 1

Answer:

The speed should be 50km/h.

Answer 2

Answer: The speed with which he could have driven the car to reach the town at 9:30 a.m. ​is 50 km/h.

Step-by-step explanation:

Given, John began his journey at 7:30 in the morning, i.e, 7:30am.

Also given, John reached at 10am.

Therefore, time taken by John is 10hours - 7.5 hours (since 30min = 0.5 hour)

Hence time taken = (10 - 7.5) = 2.5 hours.

Given, Average speed = 40 km/h

Using this data we can find distance.

Formula is , Distance = Speed x Time

Therefore distance from house to town = (40 x 2.5) km

                                     we get, distance = 100 km

Now, we need to find out speed if he had to reach at 9:30am.

Time taken from 7:30 to 9:30 is 2 hours.

Therefore speed = $\frac{distance}{time}$ = $\frac{100}{2}$ = 50 km/h

Hence, the speed with which he could have driven the car to reach the town at 9:30 a.m. ​is 50 km/h.