Question

HEY GUYS

PLZ SOLVE

A boy runs 5 minutes at a uniform speed of 10 km/h .At what speed should he Run for the next 10 minutes so the average speed comes to 12km/h

PLZ HELP!!! ​

Answer 1

Answer:

Average speed (12km/hr) = Total Distance / Total Time

                         D1 + D2 / T1 + T2

Total Time = 10 min + 20 min = 30 min = 1/2 Hour

D1 = Speed * Time = 9 * 1/6 (10 min = 1/6 hr)

= 3/2 km = 1.5 km

D2 = ?

12 = 1.5 + D2 / 1/2

12 * 1/2 = 1.5 + D2

6 = 1.5 + D2

6 - 1.5 = D2

4.5 km = D2

Speed = Distance / Time

           = 4.5 / 1/3 (20 min = 1/3 hr)

           = 4.5 * 3 (Reciprocal)

           = 13.5 km/hr

Answer 2

Answer:

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