Ahmed starts from Delhi at 8 AM to Jaipur. If his car is running at the speed of x km/hr and at 1 PM he observes that he is 20 km away from Jaipur. Find the distance between Delhi and Jaipur.

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Total time from 8 AM to 1 PM = 5 hrs.
Ahmed's car is running at the rate of x km/hr.
Distance travelled by it in 5 hours = (5 times x) km
=5x km
At 1 PM after 5 hours Ahmed is still 20km away from Jaipur.
Distance between Delhi and Jaipur = (20 km more than 5x ) km
= 5x+20 km