Question

a car moves with a speed of 80 kilometre per hour for 15 minutes and then with a speed of 60 km per hour for for the next 15 minutes the total distance covered by the car is​

Answer 1

Answer:

Distance = 35 km

Explanation:  

Case I

Speed=80km /hr

Distance=

Time = 15 minutes = $\frac{15}{60}$ hr

IN 15 MINUTES CAR COVERED =$distance = speed * time$

                                                      =   $80*\frac{15}{60}$  = 20 KM.

Case II

Speed =60 km /hr

Distance =

Time = 15 minutes = $\frac{15}{60}$ hr

IN OTHER 15 MINUTES = $distance =speed* time$

                                             $60*\frac{15}{60}$= 15 KM

Total minutes will be = 15 +15 = 30

IN 30 MINUTES = $caseI +case II$

                            =  20 KM + 15 KM = 35 KM

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