 
 <prompt> Chrystal's mota ta hau 30 mili na sa'a. Kada kuwa ta kara saukar da sauri ta hanyar gaba ta kara saukar da 50%, kuma ta kara saukar da sauri ta hanyar tafiya ta kara saukar da 20%. Idan an kama cikin hanyar ta sama da 60 mili da kuma hanyar ta tafiya zuwa asibitin hanyar ta sama da 72 mili, me yasa Crystal zata samu sa'a biyu don ta tafi hanyar ta duniya? <response>: ```The vehicle's speed decreases to 30 x 0.50 = 15 miles per hour when ascending to the top of the mountain.
So, the total time Crystal will have to spend going to the top of the mountain is 60 / 15 = 4 hours.
And the speed of the vehicle increases by 30 x 0.20 = 6 miles per hour when going down to the foot of the mountain.
So, the total speed of the vehicle when going down is 30 + 6 = 36 miles per hour.
Thus, Chrystal will have to spend 72 / 36 = 2 hours to descend from the mountain.
Therefore, the total hours she will spend to pass the whole mountain is 4 + 2 = 6 hours.

The answer will be 6.``` 