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`        A car moves for half of its time at 80 km/h and for rest half oftime at 40 km/h. Total distance covered by car is 60 km. Whatis the average speed of the car ?(a) 60 km / h(b) 80 km / h(c) 120 km / h(d) 180 km / h What is the correct answer? `
3 years ago

```							time taken to cover half distance with speed 80=distance /time(1/2*60)/80=3/8hourstime taken to cover half distance with speed 40=30/40=3/4average speed =total distance /time=60/(3/8+3/4)=53.3
```
3 years ago
```							if a body travels half time with velocity v1& another half time with v2 then ava. velocity is (v1+v2)/2 so (80+40)/2=60
```
3 years ago
```							given v1=80km/h, v2=40km/h, distance=60kmwe know thataverage speed=(v1+v2)/2=(80+40)/2, =120/2,  =60km/h
```
3 years ago
```							As We know that Distance = Speed × Time So, here D》》 80T+40T = 60 Hence T= 0.5 So , total time = 2× 0.5 which is 1 secTherefore Average speed = 60/1 = 60 km/hr
```
2 years ago
```							IN FIRST HALF                          S=V1T1              60=80T/2   =40TIN SECOND HALF                     S=V2T2             60=40T/2     =20T                          S =V1T1 +V2T2                           60=60T                          T=IHOUR                         V=TOTAL DISTANCE /TOTAL TIME                           60 KM/HOUR
```
one year ago
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