Sanjay wants to reach the railway station at 10:00 am. The station is 10 km away from his house. If Sanjay walks at a speed of 4 km/hr, then at what time should he start from his house in order to reach the station on time?

To find the time taken to travel to the station, use the formula time equals distance divided by speed, which gives 10 km divided by 4 km/hr, equaling 2.5 hours. Since 2.5 hours is 2 hours and 30 minutes, he needs to start 2 hours and 30 minutes before 10:00 am. Starting at 7:30 am will get him to the station exactly on time.

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