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त्रिबेनी को 175 किमी की यात्रा 3.5 घंटे में करनी है। हालाँकि, वह 2.5 घंटों के लिए 58 किमी/घंटा की गति से यात्रा करती है और फिर यात्रा पूर्ण करने से पहले 20 मिनट विश्राम करती है। यदि त्रिबेनी समय पर पहुँच जाती है, तब अंतिम दौर में उसकी गति ______ होगी।
⇒ 2.5 घंटे में तय दूरी = गति × समय = 58 × 2.5 = 145 किमी
⇒ शेष दूरी = 175 – 145 = 30 किमी
⇒ यात्रा में लिया गया समय = 2.5 घंटे + 20 मिनट = 170 मिनट
⇒ शेष समय = 3.5 घंटे – 170 मिनट = 210 – 170 = 40 मिनट = (2/3) घंटे
⇒ गति = 30/(2/3) = 45 किमी/घंटा
⇒ Distance travelled in 2.5 hour = speed × time = 58 × 2.5 = 145 km
⇒ Distance left = 175 – 145 = 30 km
⇒ time taken in travelling = 2.5 hours + 20 min = 170 min
⇒ Time left = 3.5 hour – 170 min = 210 – 170 = 40 min = (2/3) hour
⇒ Speed = 30/(2/3) = 45 km/hr